With temperature excessive, lie in areas by work fan (10)
I believe the answer is:
aficionado
'fan' is the definition.
(thesaurus)
'with temperature excessive lie in areas by work' is the wordplay.
I cannot quite understand how this works, but
'work' could be 'do' ('do work' can be a synonym of 'work') and 'do' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aficionado that I've seen before include "Informed enthusiast" , "Expert person" , "Fan; enthusiast" , "freak" , "Fan (Sp.)" .)