Originally aren’t elected to board (7)
I believe the answer is:
entrain
'board' is the definition.
(entraining is a kind of boarding)
'originally aren't elected' is the wordplay.
'originally' is an anagram indicator.
'elected' becomes 'in'.
'arent' is an anagram of 'entra'.
'entra'+'in'='ENTRAIN'
'to' acts as a link.
(Other definitions for entrain that I've seen before include "Board a rail service" , "Get on board railway carriages" , "Put on board at the station" , "Go on board at the station" , "Sweep along" .)