Sarah suffering with the skin disorder (4,4)

I believe the answer is:

heat rash

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

'skin disorder' is the definition.
'heat rash' can be an answer for 'skin' (thesaurus). I'm not sure about the 'disorder' bit.

'sarah suffering with the' is the wordplay.
'suffering with' indicates anagramming the letters.
'sarah' mixed up with 'the' can make 'HEAT RASH'.

Can you help me to learn more?

(Other definitions for heat rash that I've seen before include "skin complaint" , "Irritating inflammation of sweat glands" , "Itching of the skin, caused by humid hot weather" .)

I've seen this clue in The Times.

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