Tom Shatter wrongly employed by regulator displaying a degree of warmth perhaps (10)
I believe the answer is:
thermostat
'employed by regulator displaying a degree of warmth perhaps' is the definition.
I can't judge whether this definition defines the answer.
'tom shatter wrongly' is the wordplay.
'wrongly' indicates anagramming the letters.
'tom'+'shatter'='tomshatter'
'tomshatter' with letters rearranged gives 'THERMOSTAT'.
Can you help me to learn more?
(Other definitions for thermostat that I've seen before include "Temperature controller" , "Heating device" , "Temperature regulator" , "Form of control" .)