Where Do I Start?
by Kegler

Every answer appears in another answer's clue.

Where Do I Start? grid

Across
1Confused 25D to catching fifty in plot, Marc's returned (9)
6Last serving of 23D cooking; stir for best result (5)
9“Wings” actress Heche 18D sex (7)
10Shoulders having the most wounds, 14A? (7)
11Incredibly, I, Ron, had initially 30A a temporary fence (8)
12Chase us back into 7D of Peru (6)
14Nude ad Ken 1A (5)
16Ed's 11A crazy Anne's nine-piece sets (7)
19In 17D, abandon course (7)
20Eliminate periods 21D to home (5)
22Cut off, failed miserably after 1D source of funds (6)
24Ultimately 12A a strange recipe for certain receiver (8)
27Muslim leader's wife, drunken slut, 9A an adversary's capital (7)
2826D out “There's the famous loch!” with a lack of warmth (7)
29Send to joint; 20A end of sentence (5)
30Made teenager excited with taste of 19A (9)
Down
1Cutting 5D's final rebuke (8)
2Revolutionary 10A one bag, thoroughly examined (9)
3Demi 8D around adult rating involving both sexes (5)
4Sell a song, surprisingly, capturing heart of 16A in a large city (3,7)
529A to piers' paperwork, for short (4)
6Put down on paper: “3D meat, flour” (9)
7Bears fragment of bone 22A in ancient sites (5)
8Missing a wheel, De Soto's in 15D and discarded (6)
13Start of one country accepting it informally at 6A (10)
15Couple going after 2D rides in a state of neglect (9)
176D ten AM test's announcement (9)
18Adored describing 28A, finally undone (8)
21Pitcher's 13D of controversy with runner-up (6)
23Flip over including last bit of 27A in rice dish (5)
25Earlier person who snoops in one's 24A (5)
26Warbled passage from 4D (4)

Solution