Appreciative comment of one first seeing this moulding? (7)

I believe the answer is:

cornice

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'this moulding?' is the definition.
(cornice is a kind of moulding)

I can't explain the rest of the clue.

(Other definitions for cornice that I've seen before include "Overhanging ledge of frozen snow" , "Moulding along top of building" , "decorative part of room" , "Moulding between ceiling and top of a wall" , "Crane-fly" .)

I've seen this clue in The Times.

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