Choose some helicopters (3)
I believe the answer is:
opt
'choose' is the definition.
(both can mean to pick something)
'some helicopters' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'OPT' is hidden within 'helicopters'.
(Other definitions for opt that I've seen before include "Have preference for something" , "Plump for" , "Hold in the highest esteem" , "Elect" , "Choose from pot" .)