Universal measure adopted by soldier outfitting company (5)
I believe the answer is:
gucci
'outfitting company' is the definition.
I know nothing about this answer so I can't tell whether this works.
'universal measure adopted by soldier' is the wordplay.
'universal' becomes 'U' (film certificate).
'measure' becomes 'cc' (cc is a kind of measure).
'adopted by' is an insertion indicator (I've seen this in other clues).
'soldier' becomes 'GI' (GI can mean a US soldier).
'u'+'cc'='ucc'
'ucc' inserted into 'gi' is 'GUCCI'.
Can you help me to learn more?
(Other definitions for gucci that I've seen before include "Italian designer" , "Italian fashion house" .)