Amount of work in uniform adopted by soldiers (6)
I believe the answer is:
corpus
'amount of work' is the definition.
'uniform adopted by soldiers' is the wordplay.
'uniform' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.).
'adopted by' means one lot of letters goes inside another (I've seen this in other clues).
'soldiers' becomes 'corps'.
'u' put within 'corps' is 'CORPUS'.
'in' acts as a link.
(Other definitions for corpus that I've seen before include "college" , "See 13" , "The entire works of a writer" , "Collection of written texts; main body" , "Body of writing" .)