Crossword Genius

Rather dry inside quarry (6)

Ross

I believe the answer is:

pretty

'rather' is the definition.
('pretty' can be a synonym of 'rather')

'dry inside quarry' is the wordplay.
'dry' becomes 'tt' (abbreviation for teetotal).
'inside' indicates putting letters inside.
'quarry' becomes 'prey' ('prey' can be a synonym of 'quarry').
'tt' placed inside 'prey' is 'PRETTY'.

(Other definitions for pretty that I've seen before include "chocolate-box" , "pulchritudinous" , "Fair - fairly" , "like a kettle of fish" , "Pleasing to look at" .)

I've seen this clue in The Times.
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