Ruin’s remarkable interior (3)

I believe the answer is:

mar

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

'remarkable interior' is the wordplay.
'interior' says the answer is hidden in the clue (I've seen 'interior of' mean this).
'MAR' can be found hidden inside 'remarkable'.

(Other definitions for mar that I've seen before include "Spoil or deface" , "Oh dear!" , "hurt" , "'Impair, spoil (3)'" , "Disfigure" .)

I've seen this clue in The Mirror.

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