Spectator 2474

[Matakari]

Good Saturday morning, I would like some answers, with parsing if possible, to the following to get me off the ground, please. Many thanks in advance!

ACROSS:

13 Captivated European by force almost (5): ?P???
16 Pretentious nobody can butt (7) : ?IT??RN
20 Little bird beginning to eat at once (4): Y??E
22 Letters: one from this valley comes first (7) :?A?E??S
36 Nothing deters mad physicist (7) : ?????AD
38 Internet pest infernal enemy for mobile operators (10, two words) : ?????E????
39 In denims regularly market vinegars (7): ?????L?
41 Elementary group satisfied everybody, so I’d recollected (10) : ????L????? (SIMPLIFIED?)

DOWN:

10 Fly a kite in wet that steers badly (13, three words) :?????H??????S (TEST THE WATERS? )
11 Nominal leader’s policy exposed position (9, two words) : ?????L??? ( PARTY LINE? )
19 Sport in which holder not even in the highest places (9) : ???L???I?
37 Believe in ship from landlocked country (5): ??N?? ( LINER?)

[mallyh]

10 yes anagram wet that steers

[JJ109]

36 (Hans Christian)Oersted (physist) = anagram O (nothing) + deters

[JJ109]

19 Athletics (sport) = odd letters of "holder" = HLE "inside" Attics (highest places)

[JJ109]

41 Met (satisfied) + all (everybody) + oids (anagram of "so I'd") = Metalloids (group of elements of theperiodic table)

[greyfox]

16 ac. Tin horn
20ac. Tit E(at)
22ac. Dale th(i)s
38ac. Troll eymen(anag. 'enemy')
39ac. Eisells Sell in alternate letters of 'denims'
41 Met all oids(anag. 'so I'd')

11dn. Front line
37dn. S(wis)s

[Matakari]

Many thanks, JJ109 and Greyfox, for the invaluable help. I'm on my way to solving the Unclueds now!