Crossword Genius

Break down in grotto (3)

Ross

I believe the answer is:

rot

'break down' is the definition.
(I've seen this in another clue)

'in grotto' is the wordplay.
'in' indicates a hidden word.
'ROT' can be found hidden inside 'grotto'.

(Other definitions for rot that I've seen before include "Decay or disintegrate" , "Decay, wither" , "Putrefy" , "'Decay, decompose (3)'" , "Decay in grotesque way" .)

I've seen this clue in The Mirror.
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