Crossword Genius

Fourth lamp in window (12)

Ross

I believe the answer is:

quarterlight

'window' is the definition.
(quarterlight is a kind of window)

'fourth lamp' is the wordplay.
'fourth' becomes 'quarter' (synonyms).
'lamp' becomes 'light' (I've seen this before).
'quarter'+'light'='QUARTERLIGHT'

'in' is the link.

(Another definition for quarterlight that I've seen is " Small, pivoted window in car".)

I've seen this clue in The Telegraph.
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