Not still angry? (7,3)

I believe the answer is:

hopping mad

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'not still angry?' is the definition.
'hopping mad' can be an answer for 'angry?' (hopping mad means very angry). I am not certain of the 'not still' bit.

'still angry?' is the wordplay.
'still' becomes 'hopping' (I can't justify this - if you can you should give a lot more credence to this answer).
'angry?' becomes 'mad' (similar in meaning).
'hopping'+'mad'='HOPPING-MAD'

Can you help me to learn more?

(Other definitions for hopping mad that I've seen before include "Wild" , "like a kangaroo?" , "Very irate" , "Extremely angry (colloq.)" , "Furious (as a frog?)" .)

I've seen this clue in The Guardian.

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