Deficit from a season of two months? (9)

I believe the answer is:

shortfall

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'deficit' is the definition.
(I know that deficit can be written as shortfall)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for shortfall that I've seen before include "Loss" , "lack" , "Deficiency" , "Not quite what's expected" , "what we're lacking" .)

I've seen this clue in The Irish Independent.

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