Intersections
by Kegler

Nearly half (19 of 39) of the clues contain an extra letter, always in the definition. In clue order, these spell out a four-word phrase that describes two sets
of locations.  The squares in the completed diagram that are members of both sets form another four-word phrase that describes what you are doing.

Intersections grid

Across
4Wine with a diet of fried sole (4)
7Rested, taking in finale of show, a hit (4)
11Inject a curve, perhaps, in watercourse, we hear (5)
12Greek character swallowing bit of oniony taro paste (3)
13Not returning last of Evian (French water) to division of CARE (7)
14Acronym for neater haberdasher, essentially (3)
16Reportedly urge to attack state of Indira (6)
17Again show note by shattered urn (5)
18Diplomat Silas at first eagerly embraced by one from Copenhagen (5)
21Head of organization points out choices (7)
23Look back at position for Stan's alloy (5)
25Shepard returns with last of hay for antelope (5)
28Like some income, desired after the start (6)
30Chinese general is drunken sot? (3)
31Shockingly ban item on wall sides (7)
32AWOL seeker around back of bistro, cleaning stool (3)
33Small horses' problems that make things heard (5)
34The end of yesterday morning's vegetables (4)
35Returning kooks make revel (4)
Down
1Moving song about saint (5)
2Footwear with piece of Naugahyde died well (5)
3“Mr. Cool” (or not) remodeled DJ's office (7,4)
4Extended passage from panel on geriatrics (4)
5Retreats to majesty's primary throne (5)
6Australian native helping to make shiitake mushrooms (3)
7Brace final piece of staghorn coral (6)
8Cooperate, backing Ms. West, one in job fight (4,2,1,4)
9Founding, perhaps, one brand in Germany, initially (6)
10River horse's head in harnesses (6)
15One-time excellent opening belt (4)
18Heartless versifier not at all rued (4)
19Edgar Allan attempt! (6)
20Palms buffeted by a stream of hot gas (6)
22Youngsters taking in sexy pictures (6)
24Mallow starting to mature in mine entrance (5)
26Poke Nat with sled around first of November (5)
27Riotous tansy on sedge (5)
29Spirits of Fishhook Lodge (4)
31Sad, sad commercials (3)

Solution