Shepherds
by Kegler

The main diagonal describes what to look for (and where to look) in the completed grid.

Shepherds grid

Across
1LeBron constantly guards player from Denver (6)
7Subjects, say, concealed by falsehoods (6)
13Having interest in Affleck, Vardalos left a type of flower (8)
14Felt concerned and frightened without son (5)
15Old Testament describing female in poetry, frequently (3)
17Compete with every other voice (3)
18Plant from marsh's southern rim (5)
19Two letters read aloud? No problem (4)
21Lieutenant finally led company overseas, briefly (3)
22Fight and flee with MP (5)
23Read about dropping source of our incredible connection speed (4,4)
25Initially, lambs are important components of the flock (4)
27Worries about good French policeman primarily investigating clones (6,6)
29Took Lou's bad attitude (7)
30Ready everyone following running commentary's introduction (2,4)
34Latin mimic originally lampoons sartorial feature (5)
36One honored Mrs. Bush with excellent pair of teacups (8)
38Troubles from invoices after the first (4)
40Found in albumen is one dangling recessive constituent of RNA (9)
41Cretin coaxed wild stripper (6,6)
42Etiquette expert will telephone, some say (8)
43Lines out property claims (5)
Down
1Rural bachelor beginning to understand infant's complaint (7)
2Mocking tribute of Oakland ballplayers involved in nonsense (5)
3Rowed with A-Rod, upset about error (5)
4Begged for last of food, locked in behind bars (6)
5Tramps losing last of cash in reeds (5)
6Jackie felt sorry for Mae West (4,6)
8Some storylines seem tangible (2,4)
9Cicely's clan distributed papal documents (11)
10One who donates painting I've restored, in part (5)
11Rest of strips returned (5)
12Intensify red, orange and blue, surprisingly (8)
16Drum roll for needlework? (6)
20Passageway covered in extremely pretty swirling pattern (7)
24Shrewd Gore protects troubled turf (6)
26Company line riles working miners (8)
28Actor Matt returns with one cold itinerant (7)
29Ultimately too sick to return east with Fran's friend (5)
31Manufactured pearl is whiter (5)
32Great Western alliance making a case for energy (5)
33Loan fifty to netman Ivan (5)
35Cost of royal family member's name-dropping? (5)
37End with lady accepting ring (4)
39Drunk? So true! (3)

Solution