Complete some without territorials (5)
I believe the answer is:
utter
'complete' is the definition.
(I've seen this before)
'some without territorials' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'UTTER' is hidden in the letters of 'without territorials'.
(Other definitions for utter that I've seen before include "mouth" , "Express audibly" , "Give tongue to" , "To say, articulate" , "Say the words" .)