Crossword Genius

Market shows disappointment (4)

Ross

I believe the answer is:

sell

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'market' is the first definition.
(I know that market is a kind of sell)

'disappointment' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'shows' acts as a link.

Can you help me to learn more?

(Other definitions for sell that I've seen before include "Betray" , "Market, vend" , "Dispose of for money" , "Exchange for cash" , "What shops do" .)

I've seen this clue in The Globe and Mail.
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