Craft across the channel that Pole’s on (6)
I believe the answer is:
barque
'craft' is the definition.
(barque is a kind of craft)
'across the channel that pole's on' is the wordplay.
'across the channel that' becomes 'que' ('that' in French).
'pole' becomes 'bar' (both can mean a metal rod).
'on' is a charade indicator (letters next to each other).
'que' after 'bar' is 'BARQUE'.
(Other definitions for barque that I've seen before include "Sailing boat" , "Three-masted ship" , "sailing-ship" , "Small ship" , "Sailing ship" .)