Crossword Genius

Fool around in class, needing slap to restore peace? (4,3,4,2)

Ross

I believe the answer is:

kiss and make up

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

'fool around in class' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'slap to restore peace?' is the wordplay.
I cannot quite understand how this works, but
'slap' could be 'makeup' (I've seen this before) and 'makeup' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'needing' is the link.

Can you help me to learn more?

(Other definitions for kiss and make up that I've seen before include "Become reconciled" , "reconcile differences" , "Forgive and forget" .)

I've seen this clue in The Independent.
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