Times Jumbo 1350

[NeilMunro]

Very grateful for all help with these clues please.
23ac: “Returned to London, perhaps, with Lou or Carol, crushed (6).”
37ac: “Document this large would be plain to see (4).”
55 ac: “Head of Soviet Union embracing English song and dance man? (6).”
29 dn: “Gas pressure viewed with alarm (7).”

[Captain2]

29 Prattle

[Mamyalynne]

29 P Rattle

[Captain2]

55 Fusser

[Mamyalynne]

37 Writ (...large)

[Lie-in King]

23a Pureed - 'up' (to London, perhaps, returned) + (Lou or Carol) Reed'
37a Writ
55a Fusser - 'f(ormer; head) USSR' (embracing) 'E(nglish)'
29d P-rattle

[Captain2]

23 Pureed

[Mamyalynne]

23 Pureed

Up, back + Reed

[Captain2]

Neil, always much nicer if you can give us any letters you already have placed. Ta muchly.

[NeilMunro]

Many thanks all!