Crossword Genius

Cross closer to turn (4)

Ross

I believe the answer is:

rood

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rood that I've seen before include "Crucifix - old unit of area" , "- Loft; - screen" , "Old land measure of quarter of an acre" , "Area equal to 40 square rods" , "Cross, crucifix" .)

I've seen this clue in The Guardian.
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