Auction in Greater Manchester town (4)
I believe the answer is:
sale
I believe this is a double definition.
'auction' is the first definition.
(type of sale)
'greater manchester town' is the second definition.
'in' is the link.
(Other definitions for sale that I've seen before include "Offer period" , "Transaction" , "See 12 Down" , "Public auction" , "Auction - somewhere in Greater Manchester" .)