Get cast adrift in boat (6)

I believe the answer is:
obtain
'get cast' is the definition.
'obtain' can be an answer for 'get' (synonyms). I am not certain of the 'cast' bit.
'adrift in boat' is the wordplay.
'adrift' indicates an anagram.
'in'+'boat'='inboat'
'inboat' anagrammed gives 'OBTAIN'.
Can you help me to learn more?
(Other definitions for obtain that I've seen before include "Get - secure" , "Come into possession of" , "Hold good" , "Get, procure" , "Gain possession of" .)
