Persons working keep going (5,2)

I believe the answer is:

press on

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'keep going' is the definition.
(I've seen this in another clue)

'persons working' is the wordplay.
'persons' can be anagrammed to 'PRESS ON'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for press on that I've seen before include "Persevere doggedly, quickly" , "Continue (with action)" , "don't stop!" , "Hasten insistently" , "Continue going forward" .)

I've seen this clue in The Times.

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