Solver occasionally recording loss of consciousness (5)
I believe the answer is:
sleep
'loss of consciousness' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'solver occasionally recording' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'recording' becomes 'EP' (short for Extended Play, type of record).
The alternating letters of 'solver' are 'sle'.
'sle'+'ep'='SLEEP'
Can you help me to learn more?
(Other definitions for sleep that I've seen before include "Slumber" , "crash" , "Drop off" , "Doze, nap" , "Shut-eye" .)