Cart making noise at back of pub (6)
I believe the answer is:
barrow
'cart' is the definition.
(barrow is a kind of cart)
'noise at back of pub' is the wordplay.
'noise' becomes 'row'.
'at back of' is a charade indicator (letters next to each other).
'pub' becomes 'bar' (both are drinking establishments).
'row' after 'bar' is 'BARROW'.
'making' acts as a link.
(Other definitions for barrow that I've seen before include "Cart; grave mound" , "such as street-trader might have?" , "Northern town" , "One-wheeled handcart" , "Small cart with two wheels, or old burial mound" .)