Partially defrosting potato dish (5)

I believe the answer is:

rosti

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

'partially defrosting' is the wordplay.
'partially' says the answer is hidden in the clue.
'ROSTI' can be found hidden inside 'defrosting'.

(Other definitions for rosti that I've seen before include "Potato cake" , "fried potato" , "potato dish" .)

I've seen this clue in The Guardian.

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