Crosspiece (7)

I believe the answer is:

transom

'crosspiece' is the definition.
(transom is a kind of crosspiece)

This is the entire clue.

(Other definitions for transom that I've seen before include "Rectangular fanlight" , "Bar above window or door" , "Cross-beam" , "Strengthening crossbar" , "Cross-member of boat or window" .)

I've seen this clue in the Sydney Morning Herald.

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