German in uncovered boat (5)
I believe the answer is:
barge
'boat' is the definition.
(barge is a kind of boat)
'german in uncovered' is the wordplay.
'german' becomes 'g' (abbreviation).
'in' is an insertion indicator.
'uncovered' becomes 'bare' ('bare' can be similar in meaning to 'uncovered').
'g' put within 'bare' is 'BARGE'.
(Other definitions for barge that I've seen before include "Bump" , "Violently push" , "Wide, flat-bottomed boat" , "Flat-bottomed cargo boat" , "Canal boat maybe" .)