Shoot any number out of season (5)
I believe the answer is:
sprig
'shoot' is the definition.
(thesaurus)
'any number out of season' is the wordplay.
'any number' becomes 'n' (I've seen this in other clues).
'out of' indicates named letters should be taken away.
'season' becomes 'spring' (spring is a kind of season).
'spring' with 'n' removed is 'SPRIG'.
(Other definitions for sprig that I've seen before include "Small stem bearing flowers" , "Young shoot" , "Stem of holly, for example" , "What may be flowering" , "Spray or twig" .)