Crossword Genius

Rotary file (4)

Ross

I believe the answer is:

burr

'rotary file' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for burr that I've seen before include "Prickly, clinging seed-case" , "Rough pronunciation of the letter r as in some areas" , "trouble" , "Former US vice-president - dialect way of pronouncing R" , "Clinging seed-case; whetstone" .)

I've seen this clue in the Evening Standard and The Independent.
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