Crossword Genius

Keep one plugging away? Hardly (6)

Ross

I believe the answer is:

adhere

'keep' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for adhere that I've seen before include "Stick or cleave to" , "Stick like a stamp" , "Stick to or continue faithful" , "Cling, attach" , "Agree" .)

I've seen this clue in The Independent.
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