Crossword Genius

Left gap for window (8)

Ross

I believe the answer is:

porthole

'for window' is the definition.
(porthole is a kind of window)

'left gap' is the wordplay.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'gap' becomes 'hole' (hole is a kind of gap).
'port'+'hole'='PORTHOLE'

(Other definitions for porthole that I've seen before include "Small watertight opening in ship's side" , "Circular window in ship" , "Through which sailor can see" , "from which sea can be seen" , "firing through this" .)

I've seen this clue in The Telegraph.
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