Upset to some extent, civilian omits ethical character statement (11)
I believe the answer is:
testimonial
'character statement' is the definition.
(a testimonial describes someone's character)
'upset to some extent civilian omits ethical' is the wordplay.
I cannot really understand how this works, but
'upset' could be 'tes' (I've seen this in other clues) and 'tes' is present in the answer.
'some' could be 'a' and 'a' is found within the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for testimonial that I've seen before include "special match" , "Commendation" , "Public tribute (to someone)" , "A written character" , "Character recommendation - tribute for service" .)