Crossword Genius

Work faster, in arrears, when the chance of dismissal is greater (5,2)

Ross

I believe the answer is:

catch up

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'work' is the definition.
The definition and answer can be both related to thinking as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for catch up that I've seen before include "Draw level" , "Backward student must try to do this" , "Lag no longer" , "Prepare to overtake" , "Regain equality" .)

I've seen this clue in the Evening Standard.
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