Secure trip in boat (6)
I believe the answer is:
obtain
'secure' is the definition.
(synonyms)
'trip in boat' is the wordplay.
'trip' is an anagram indicator.
'in'+'boat'='inboat'
'inboat' is an anagram of 'OBTAIN'.
(Other definitions for obtain that I've seen before include "Gain possession of" , "Get - secure" , "Hold good" , "Come into possession of" , "Get, procure" .)