Thoroughly intended - such barbs are accurate (4-5)

I believe the answer is:

well-aimed

'such barbs are accurate' is the definition.
(a well-aimed barb is accurate)

'thoroughly intended' is the wordplay.
'thoroughly' becomes 'well' (I've seen this in another clue).
'intended' becomes 'aimed' (aiming is a kind of intending).
'well'+'aimed'='WELL-AIMED'

I've seen this clue in The Independent.

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