Deployed joint force European commanded, holding weapon (7)
I believe the answer is:
elbowed
'deployed joint force' is the definition.
(the elbow is a joint)
'european commanded holding weapon' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'commanded' becomes 'led' (lead can mean to be in command of).
'holding' is an insertion indicator.
'weapon' becomes 'bow' (bow is a kind of weapon).
'led' going around 'bow' is 'lbowed'.
'e'+'lbowed'='ELBOWED'
(Other definitions for elbowed that I've seen before include "Pushed (someone aside)" , "Jostled" .)