Foolhardy artist's hot-headed (4)

I believe the answer is:

rash

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'foolhardy' is the definition.
(I know that foolhardy can be written as rash)

'artist's hot-headed' is the wordplay.
'artist's' becomes 'RA's' (Royal Academician, member of Royal Academy of Arts).
'hot-headed' becomes 'h' (this could be a standard abbreviation I've not previously seen).
'ras'+'h'='RASH'

Can you help me to learn more?

(Other definitions for rash that I've seen before include "Precipitate" , "sign of irritation?" , "(Armed) incursion (into another country)" , "Impulsive, hasty" , "Hives" .)

I've seen this clue in the Sydney Morning Herald.

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