An endearingly attractive grave (5)

I believe the answer is:

acute

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'grave' is the definition.
(I've seen this before)

'an endearingly attractive' is the wordplay.
'an' becomes 'a'.
'endearingly attractive' becomes 'cute' (similar in meaning. I am not sure about the 'endearingly' bit.).
'a'+'cute'='ACUTE'

Can you help me to learn more?

(Other definitions for acute that I've seen before include "Shrewd; serious" , "(Of an angle) less than 90deg" , "Discerning" , "far from chronic" , "Severe; French accent" .)

I've seen this clue in The Times.

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