Projecting feature observed gripping a tool (8)

I believe the answer is:

chainsaw

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'tool' is the definition.
(type of tool)

'projecting feature observed gripping a' is the wordplay.
'projecting feature' becomes 'chin' (facial feature. I am not sure about the 'projecting' bit.).
'observed' becomes 'saw' (seen).
'gripping' indicates putting letters inside (inserted letters are gripped).
'chin'+'saw'='chinsaw'
'chinsaw' enclosing 'a' is 'CHAINSAW'.

Can you help me to learn more?

(Other definitions for chainsaw that I've seen before include "Timber cutter" , "powered device" , "Texas massacre tool" , "woodcutter?" , "Tree-lopper's tool" .)

I've seen this clue in The Telegraph.

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