Times Cryptic 27,750

[NeilMunro]

Very grateful for all help with these clues please.
11ac: “Preserve and deliver letter at the end, then track (6-3).”
14ac: “Scandinavian girl initially bringing in chicken, and something for dips later? (10).”
18ac: “Am merely puzzled, with no way of looking back? (6,4).”
24ac: “Replacing another very young airman who crashed orbiting moon (9).”

[Captain2]

24 Vicarious

[Lie-in King]

11a Freeze-dry - 'free (deliver) zed (letter at end) r(ailwa)y (track)'
14a Fingerbowl - 'Inger b(ringing; initially)' (in) 'fowl'
18a Memory lane - anag 'am merely + no'
24a Vicarious - 'v(ery) Icarus' (orbiting) 'Io' (moon)

[writesbad]

freeze dry

[Captain2]

18 Memory Lane - anagram of 'am merely no'

[NeilMunro]

Many thanks!!!