Crossword Genius

Injured hand that hurts a lot (3,3)

Ross

I believe the answer is:

and how

I'm a little stuck... Click here to teach me more about this clue!

'a lot' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'injured hand that hurts' is the wordplay.
I cannot quite see how this works, but
an anagram of 'hand' is 'andh' which is present in the answer.
'that hurts' could be 'ow' and 'ow' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for and how that I've seen is " Certainly".)

I've seen this clue in The Guardian.
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