Curiously moth at rest maintains constant temperature (10)

I believe the answer is:

thermostat

I'm a little stuck... Click here to teach me more about this clue!

'maintains constant temperature' is the definition.
I can't tell whether this defines the answer.

'curiously moth at rest' is the wordplay.
'curiously' is an anagram indicator.
'moth'+'at'+'rest'='mothatrest'
'mothatrest' is an anagram of 'THERMOSTAT'.

Can you help me to learn more?

(Other definitions for thermostat that I've seen before include "Temperature regulator" , "Form of control" , "Temperature controller" , "Heating device" .)

I've seen this clue in The Irish Times.

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