Non-commissioned officer disturbing poor Carl (8)
I believe the answer is:
corporal
'non-commissioned officer' is the definition.
(I've seen this before)
'disturbing poor carl' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'poor'+'carl'='poorcarl'
'poorcarl' anagrammed gives 'CORPORAL'.
(Other definitions for corporal that I've seen before include "characterising a body" , "Of the body, like NCO" , "Poor Carl (anag)" , "Of the body, say punishment" , "Army rank" .)