Crossword Genius

It goes round or back to the far end (5)

Ross

I believe the answer is:

rotor

'it goes round' is the definition.
(I've seen this before)

'or back to the far end' is the wordplay.
'back' is a reversal indicator.
'end' suggests the final letters.
The final letter of 'far' is 'r'.
'or' backwards is 'ro'.
'ro'+'to'+'r'='ROTOR'

(Other definitions for rotor that I've seen before include "Turning part of machine, palindromic" , "Dynamo part" , "part of chopper" , "Palindromic moving part" , "Reversible piece of moving machinery?" .)

I've seen this clue in the Evening Standard.
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