Crossword Genius

Thin straight bar (3)

Ross

I believe the answer is:

rod

'thin straight bar' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rod that I've seen before include "Instrument of punishment" , "Baton, pole" , "Angler's cane" , "Little boy" , "Spare it and spoil the child, they used to say" .)

I've seen this clue in The Times.
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