Crossword Genius

They change locks in doors once you blocked holes? (5)

Ross

I believe the answer is:

dyers

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'they change locks in doors' is the definition.
The definition suggests an adverb but the answer is not.

'you blocked holes?' is the wordplay.
'you' becomes 'yer' ('yer' is a dialect form of 'you').
'blocked' indicates putting letters inside (to block can mean to box in or contain).
'holes?' becomes 'ds' (I can't explain this - if you can you should give a lot more credence to this answer).
'yer' inserted inside 'ds' is 'DYERS'.

'once' acts as a link.

Can you help me to learn more?

(Other definitions for dyers that I've seen before include "Stainers of cloth" , "Colour-changers" , "14 [SWANUPPING] company" .)

I've seen this clue in the Sydney Morning Herald.
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