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Grateful for any help with these particularly parsing.
6d. Keen to call short cosmonaut (7) G-G-R-N
Must be GAGARIN and call short is probably rin(g) but gaga?
17d One’s sorry about old actor (7) —I-I-R
OLIVIER ?
17a One sending bill (6) —S-E-

I think when you are 'gaga' about something, you are very keen,
enthusiastic about it.

17 POSTER

6d: Gagarin = cosmonaut (def)
gaga- keen
rin(g) - call

17d: Poitier = actor
pitier - one's sorry
o - old

17a: poster
(double definition)

Thank you for all the help.

You are very welcome!