Barge in here perhaps with tin (aluminium) (5)
I believe the answer is:
canal
'barge in here' is the definition.
(a barge might travel through a canal)
'with tin aluminium' is the wordplay.
'with' means one lot of letters go next to another.
'tin' becomes 'can' (synonyms).
'aluminium' becomes 'al' (chemical symbol).
'can' next to 'al' is 'CANAL'.
'perhaps' acts as a link.
(Other definitions for canal that I've seen before include "Inland waterway" , "Grand Union perhaps" , "eg Grand Union" , "Artificial waterway for barges" , "Man-made waterway" .)