Auction grouping (3)
I believe the answer is:
lot
'auction grouping' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lot that I've seen before include "one whose wife should be remembered" , "is to be knocked down" , "Abraham's nephew - assigned share" , "Great amount" , "He left his wife without a backward glance" .)