Crossword Genius

Refined what some tenants may do when rent finally gets raised (6)

Ross

I believe the answer is:

subtle

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

I can't explain the rest of the clue.

(Other definitions for subtle that I've seen before include "Not immediately obvious, understated" , "Tenuous; refined" , "Fine, delicate or elusive" , "Ingenious, difficult to analyse" , "Slight and difficult to analyse, as distinction may be" .)

I've seen this clue in The Guardian.
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