Have remorse about a piece of cruelty (3)

I believe the answer is:

rue

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'have remorse' is the definition.
'rue' can be an answer for 'remorse' (thesaurus). I'm not certain of the 'have' bit.

'a piece of cruelty' is the wordplay.
'a piece of' says the answer is hidden in the clue.
'RUE' can be found hidden inside 'cruelty'.

'about' acts as a link.

Can you help me to learn more?

(Other definitions for rue that I've seen before include "Regret the bitter herb" , "Feel remorse" , "Swann's way?" , "Regret, be sorry for" , "Bitterly regret - plant" .)

I've seen this clue in the Evening Standard.

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