Flag celebrated with any number coming out (3)
I believe the answer is:
sag
'flag' is the definition.
(synonyms)
'celebrated with any number coming out' is the wordplay.
I cannot really see how this works, but
'number' could be 'g' (G is an example) and 'g' is present in the answer.
The remaining letters 'sa' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
(Other definitions for sag that I've seen before include "Sink, hang down" , "Sink (under load)" , "Sink under weight" , "Give in the middle" , "fall" .)