Adopt, embrace (7)
I believe the answer is:
espouse
I believe this clue is a double definition.
'adopt' is the first definition.
(synonyms)
'embrace' is the second definition.
(synonyms)
(Other definitions for espouse that I've seen before include "Take in marriage" , "Marry -- take on as a cause" , "Follow and promote a cause" , "Adopt - give support to" , "Embrace" .)