Crossword Genius

Window fastener's broken (8)

Ross

I believe the answer is:

fenestra

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

'fastener's broken' is the wordplay.
'broken' indicates an anagram.
'fastener' anagrammed gives 'FENESTRA'.

(Other definitions for fenestra that I've seen before include "window" , "Spot with tigers" .)

I've seen this clue in The Telegraph.
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