Navigator in Atlantic finally repaired boat (5)
I believe the answer is:
cabot
'navigator' is the definition.
(I know that Cabot is a navigator)
'atlantic finally repaired boat' is the wordplay.
'finally' indicates one should take the final letters.
'repaired' indicates an anagram.
The final letter of 'atlantic' is 'c'.
'boat' anagrammed gives 'abot'.
'c'+'abot'='CABOT'
'in' is the link.
(Other definitions for cabot that I've seen before include "famous explorer" , "John (Giovanni) -, navigator, explored N. America" , "John (or Sebastian), Tudor explorer" , "Italian explorer (father or son)" , "Name of two Italian navigator-explorers of the New World, father John and son Sebastian" .)