Infant's hot jaw worried satirist (8,5)
I believe the answer is:
jonathan swift
'satirist' is the definition.
(I know that Jonathan Swift is a satirist)
'infant's hot jaw worried' is the wordplay.
'worried' indicates anagramming the letters (worry can mean to interfere with or disturb).
'infants'+'hot'+'jaw'='infantshotjaw'
'infantshotjaw' is an anagram of 'JONATHAN SWIFT'.
(Other definitions for jonathan swift that I've seen before include "Satirical dean" , "18th century dean and writer" , "Literary creator of Lilliput" .)