Salary increased, settle arrears (3,2)

I believe the answer is:

pay up

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'settle arrears' is the definition.
'pay up' can be an answer for 'settle' (paying up is a kind of settling). I am not sure about the 'arrears' bit.

'salary increased' is the wordplay.
'salary' becomes 'pay' (synonyms).
'increased' becomes 'up' (something that's up has increased or risen).
'pay'+'up'='PAY UP'

Can you help me to learn more?

(Other definitions for pay up that I've seen before include "Discharge a debt" , "Hand over the money" , "Settle" , "Give me the money!" .)

I've seen this clue in The Telegraph.

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