Charge after soldiers, primarily wanting cover once more (6)
I believe the answer is:
rewrap
'cover once more' is the definition.
('wrap' is an answer for 'cover' so perhaps 'rewrap' is OK for 'cover once more')
'charge after soldiers primarily wanting' is the wordplay.
'charge' becomes 'rap' (both can mean blame or responsibility).
'after' is a charade indicator (letters next to each other).
'soldiers' becomes 're' (Royal Engineers).
'primarily' indicates taking the first letters.
The initial letter of 'wanting' is 'w'.
're'+'w'='rew'
'rap' after 'rew' is 'REWRAP'.
(Other definitions for rewrap that I've seen before include "Again parcel" , "Again cover in paper" .)