Get different boat in (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that get can be written as obtain)
'different boat in' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'boat' anagrammed gives 'obta'.
'obta'+'in'='OBTAIN'
(Other definitions for obtain that I've seen before include "Get - secure" , "Hold good" , "Take possession of" , "Gain possession of" , "'Get, acquire (6)'" .)