Auction seal off (4)

I believe the answer is:

sale

'auction' is the definition.
(I know that auction can be written as sale)

'seal off' is the wordplay.
'off' is an anagram indicator.
'seal' with letters rearranged gives 'SALE'.

(Other definitions for sale that I've seen before include "Clearance of goods at reduced prices" , "Exchange of goods for fixed amount" , "Bargain-price event" , "Period of low prices" , "Occasion for buying at reduced prices" .)

I've seen this clue in The Mirror.

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