Manage board (3,2)
I believe the answer is:
get on
I believe this clue is a double definition.
'manage' is the first definition.
(thesaurus)
'board' is the second definition.
(synonyms)
(Other definitions for get on that I've seen before include "Make progress or mount up" , "Enjoy harmonious relationship" , "Age; prosper" , "Make progress or climb aboard" , "Board; establish good relations" .)