Parent exchanged boring tool (6)

I believe the answer is:

trepan

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'boring tool' is the definition.
'trepan' can be an answer for 'tool' (trepan is a kind of tool). I'm unsure of the 'boring' bit.

'parent exchanged' is the wordplay.
'exchanged' indicates an anagram.
'parent' is an anagram of 'TREPAN'.

Can you help me to learn more?

(Other definitions for trepan that I've seen before include "Surgical saw" , "Cranial surgical instrument" , "cut through bone" , "Surgical instrument used to remove sections of bone from the skull" , "old saw" .)

I've seen this clue in The Independent.

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