Local argument for ancient burial mound (6)
I believe the answer is:
barrow
'ancient burial mound' is the definition.
(I've seen this before)
'local argument' is the wordplay.
'local' becomes 'bar' (I've seen this before).
'argument' becomes 'row' (I've seen this before).
'bar'+'row'='BARROW'
'for' is the link.
(Other definitions for barrow that I've seen before include "Small cart with two wheels, or old burial mound" , "Cumbrian town" , "Cart used by street vendor" , "Small hand-propelled cart" , "where items are sold" .)