That elegant grace porpoises have (5)

I believe the answer is:

poise

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'that elegant' is the definition.
I can't tell whether this defines the answer.

'grace porpoises have' is the wordplay.
'have' indicates the answer is hidden within the clue.
'POISE' is hidden within 'grace porpoises'.

Can you help me to learn more?

(Other definitions for poise that I've seen before include "Coolness and composure under strain" , "Aplomb" , "Sang-froid" , "Dignified and self-assured manner" , "Grace; equilibrium" .)

I've seen this clue in the Evening Standard.

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