To sleep less backfires, operatically (6)
I believe the answer is:
repose
'to sleep' is the definition.
(thesaurus)
'less backfires operatically' is the wordplay.
'REPOSE' is hidden back-to-front in amongst the letters.
However, I am unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for repose that I've seen before include "calm" , "Relaxation" , "take it easy" , "Lie at rest" , "State of tranquillity" .)