Claps carelessly on one's head! (5)

I believe the answer is:

scalp

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'one's head' is the definition.
'scalp' can be an answer for 'head' (thesaurus). I'm not sure about the 'one's' bit.

'claps carelessly' is the wordplay.
'carelessly' indicates an anagram.
'claps' anagrammed gives 'SCALP'.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for scalp that I've seen before include "wants to resell theatre tickets" , "Track, way" , "Hair producer" , "Token of victory" , "Cut hair very short" .)

I've seen this clue in the Evening Standard.

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