Fetch naval leader in ship (5)
I believe the answer is:
bring
'fetch' is the definition.
(synonyms)
'naval leader in ship' is the wordplay.
'leader' suggests taking the first letters.
'in' indicates putting letters inside.
'ship' becomes 'brig' (I've seen this before).
The initial letter of 'naval' is 'n'.
'n' placed inside 'brig' is 'BRING'.
(Other definitions for bring that I've seen before include "Come along with" , "Carry (to a place)" , "Get" , "Fetch; cause to come" , "Escort" .)