Childhood malady (7)

I think it could be either:

Which length description are you looking for?:

measles

'childhood malady' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for measles that I've seen before include "Children's disease with red spots" , "Morbilli is technical term for this illness" , "I appear as 8 [RASH]" , "Rash-causing disease" , "Children's viral disease" .)

I've seen this clue in the Newsday, the Irish Times (Simplex), the Newsday.com and the King Feature Syndicate.

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