Beer US soldier opens with nimble movements? (5)
I believe the answer is:
agile
'with nimble movements?' is the definition.
'beer us soldier opens' is the wordplay.
'beer' becomes 'ale' (I've seen this before).
'us soldier' becomes 'gi' (I've seen this in other clues).
'opens' is an insertion indicator (one set of letters makes an 'opening' in another).
'ale' enclosing 'gi' is 'AGILE'.
(Other definitions for agile that I've seen before include "Nimble, supple" , "Moving quickly and easily" , "Nifty" , "Nimble, lively" , "Moving quickly/easily" .)