Person of recognised art, like Pasquale? I'm hot! (5)
I believe the answer is:
radon
'i'm hot' is the definition.
(hot chemical element)
'person of recognised art like pasquale?' is the wordplay.
'person of recognised art' becomes 'RA' (Royal Academician, Royal Academy of Arts member).
'like pasquale?' becomes 'don' (Don Pasquale is an opera).
'ra'+'don'='RADON'
(Other definitions for radon that I've seen before include "Radioactive gas, linked to granite" , "Element, symbol Rn" , "gets no reaction" , "Inert gas that occurs naturally" , "A radioactive gas, symbol Rn" .)