Get that drifting boat in! (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that obtain is a type of get)
'drifting boat in' is the wordplay.
'drifting' indicates anagramming the letters.
'boat' with letters rearranged gives 'obta'.
'obta'+'in'='OBTAIN'
'that' is the link.
(Other definitions for obtain that I've seen before include "Take possession of" , "Get or lay hold of" , "Get - secure" , "Gain possession of" , "Come into possession of" .)