Crossword Genius

Cross over a door (4)

Ross

I believe the answer is:

rood

'cross' is the definition.
(term for a crucifix)

'over a door' is the wordplay.
'over' is a reversal indicator.
'door' written backwards gives 'ROOD'.

(Other definitions for rood that I've seen before include "Crucifix; old land area measure" , "The Holy . . . . was the Cross of Christ" , "Crucifix in entrance, set back" , "Crucifix on door" , "Crucifix in church; one quarter of an acre" .)

I've seen this clue in The Globe and Mail.
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