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Increase in work for the summer (8)

Ross

I believe the answer is:

addition

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'the summer' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'increase in work' is the wordplay.
'increase' becomes 'add' (I've seen this in another clue).
'in work' becomes 'ition' (I can't justify this - if you can you should believe this answer much more).
'add'+'ition'='ADDITION'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for addition that I've seen before include "Combination of numbers to find the sum" , "Mathematical procedure" , "an arithmetical process" , "Tally, tot" , "plus" .)

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