Trifling - like a naval officer? (5)
I believe the answer is:
petty
This clue could be a double definition.
'trifling' is the first definition.
(I've seen this before)
'naval officer?' is the second definition.
'petty' can be an answer for 'officer?' (petty officer is a kind of officer). I am not certain of the 'naval' bit.
'like a' is the link.
Can you help me to learn more?
(Other definitions for petty that I've seen before include "Insignificant or trivial" , "Trivial, piffling" , "This cash is of a trivial amount" , "Marked by narrowness of mind" , "Inferior" .)