Forwards including a captain? (5)
I believe the answer is:
ahead
'forwards' is the definition.
(synonyms)
'a captain?' is the wordplay.
'captain?' becomes 'head' (both can mean a leader).
'a'+'head'='AHEAD'
'including' is the link.
(Other definitions for ahead that I've seen before include "In front as in race" , "Forward - in front" , "In the vanguard" , "at pole" , "In the future" .)