He joins a girl at the far end (6)
I believe the answer is:
oliver
'he' is the definition.
'a girl at the far end' is the wordplay.
'a girl' becomes 'Olive' (girl's name).
'at' means one lot of letters go next to another.
'the far end' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'olive'+'r'='OLIVER'
'joins' acts as a link.
Can you help me to learn more?
(Other definitions for oliver that I've seen before include "-- Reed, actor" , "Paladin (with Roland)" , "Orphan recruited by criminal gang" , "One taking pride in food" , "Fictional boy who famously asked for more" .)