Crossword Genius

"A powerful feller!" Bond observed (8)

Ross

I believe the answer is:

chainsaw

'a powerful feller' is the definition.
(something which might fell trees)

'bond observed' is the wordplay.
'bond' becomes 'chain' (chain is a kind of bond).
'observed' becomes 'saw' (seen).
'chain'+'saw'='CHAINSAW'

(Other definitions for chainsaw that I've seen before include "powered device" , "Texas massacre tool" , "Power tool" , "Powered cutter" , "Timber cutter" .)

I've seen this clue in The Times.
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