Asleep, but prepared to slip away (6)
I believe the answer is:
elapse
'to slip away' is the definition.
(synonyms)
'asleep but prepared' is the wordplay.
'asleep' can be anagrammed to 'ELAPSE'.
However, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for elapse that I've seen before include "Go past" , "Tick by" , "Slip away" , "Pass away - asleep (anag)" , "Of time, pass by - please" .)