A clever sort of angle? (5)

I believe the answer is:

acute

'sort of angle' is the definition.

'a clever' is the wordplay.
'clever' becomes 'cute' (I've seen this in another clue).
'a'+'cute'='ACUTE'

(Other definitions for acute that I've seen before include "Urgently pressing" , "not seen in cafe here!" , "Perspicacious" , "Sharp as of mind - or pain" , "Very perceptive, having sharp mind" .)

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

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