Crossword Genius

Additional pay for a sincere sort (8)

Ross

I believe the answer is:

increase

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

'additional pay' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'a sincere sort' is the wordplay.
'sort' indicates an anagram.
'a'+'sincere'='asincere'
'asincere' with letters rearranged gives 'INCREASE'.

'for' is the link.

Can you help me to learn more?

(Other definitions for increase that I've seen before include "step up" , "Grow bigger" , "boost" , "extra money at work" , "Become bigger or greater in amount" .)

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