Barge meets large digger (6)
I believe the answer is:
shovel
'digger' is the definition.
('shovel' can be a synonym of 'digger')
'barge meets large' is the wordplay.
'barge' becomes 'shove' (I've seen this before).
'meets' is a charade indicator (letters next to each other).
'large' becomes 'l'.
'shove'+'l'='SHOVEL'
(Other definitions for shovel that I've seen before include "Old clerical hat" , "Spade with a broad blade" , "Spade with a curved blade" , "Hand tool" , "Tool for lifting and carrying" .)