Crossword Genius

Turning it round is laborious (6)

Ross

I believe the answer is:

tiring

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

'turning it round' is the wordplay.
'turning' is a reversal indicator.
'round' becomes 'ring' ('ring' can be a synonym of 'round'**).
'it' backwards is 'ti'.
'ti'+'ring'='TIRING'

'is' is the link.

(Other definitions for tiring that I've seen before include "Growing weary or bored" , "Becoming sleepy" , "Exhausting or tedious" , "Laborious" , "Boring" .)

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