Score with men helping around box (13)
I believe the answer is:
orchestration
'score' is the definition.
(orchestration is scoring musically)
'men helping around box' is the wordplay.
'men' becomes 'or' (military abbreviation for Other Ranks).
'helping' becomes 'ration' (a ration is a serving or helping).
'around' is an insertion indicator.
'box' becomes 'chest' (chest is a kind of box).
'or'+'ration'='orration'
'orration' going around 'chest' is 'ORCHESTRATION'.
'with' acts as a link.
(Other definitions for orchestration that I've seen before include "Composer's skill" , "Scoring for strings, brass, woodwind and percussion" , "Note arrangement" , "Stage-management" , "Musical arrangement" .)