Letters initially relating to tax (4)

I believe the answer is:

paye

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'to tax' is the definition.
(PAYE is an example)

I don't understand the rest of the clue.

(Other definitions for paye that I've seen before include "Plain man's income tax system" , "System of withholding tax" , "The working man's income tax system" , "The working persons' tax system" , "The tax system for the working man" .)

I've seen this clue in the Evening Standard.

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