Conceited as a midshipman (6)
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I believe the answer is:
snotty
I believe this is a double definition.
'conceited' is the first definition.
(I've seen this before)
'a midshipman' is the second definition.
(I've seen this before)
'as' acts as a link.
(Other definitions for snotty that I've seen before include "Snobbish" , "Showing contempt, too big for one's breeches" , "Midshipman" , "superior" , "Conceited - foul with nasal discharge" .)