Just what you want when heartlessly nettled! (4)

I believe the answer is:

need

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'just what you want' is the definition.
I can't tell whether this definition defines the answer.

'heartlessly nettled' is the wordplay.
'heartlessly' suggests removing the centre.
'nettled' with its middle removed is 'NEED'.

'when' is the link.

Can you help me to learn more?

(Other definitions for need that I've seen before include "Require; want" , "state requiring relief" , "'miss'" , "Necessitate" , "Lack - demand" .)

I've seen this clue in the Evening Standard.

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