Soldier on manoeuvres ever trailing as such (9)
I believe the answer is:
persevere
'soldier on' is the definition.
(I've seen this before)
'manoeuvres ever trailing as such' is the wordplay.
'manoeuvres' indicates anagramming the letters (letters manoeuvred in a new way).
'trailing' says to put letters next to each other.
'as such' becomes 'per se' (synonyms).
'ever' with letters rearranged gives 'vere'.
'vere' put after 'perse' is 'PERSEVERE'.
(Other definitions for persevere that I've seen before include "Persist, stick at" , "Hang on in there" , "Continue despite difficulties" , "Carry on regardless" , "Struggle on!" .)