Grave pub altercation (6)
I believe the answer is:
barrow
'grave' is the definition.
(I've seen this before)
'pub altercation' is the wordplay.
'pub' becomes 'bar' (I've seen this before).
'altercation' becomes 'row' (I've seen this before).
'bar'+'row'='BARROW'
(Other definitions for barrow that I've seen before include "Small hand-propelled cart" , "old burial ground" , "Cart used by street vendor" , "Small cart with two wheels, or old burial mound" , "Small cart for a prehistoric burial mound" .)