Overture from Fauré playing, then I hear scale (10)
I believe the answer is:
fahrenheit
'scale' is the definition.
(Fahrenheit temperature scale)
'overture from faure playing then i hear' is the wordplay.
'overture from' indicates taking the first letters (the introduction or overture to the word).
'playing' indicates an anagram.
The initial letter of 'faure' is 'f'.
'then'+'i'+'hear'='thenihear'
'thenihear' is an anagram of 'ahrenheit'.
'f'+'ahrenheit'='FAHRENHEIT'
(Other definitions for fahrenheit that I've seen before include "Man of some scale" , "Measure of warmth" , "On which water freezes at 32 deg." , "Physicist; temperature scale" , "Finer heath (anag.)" .)