Go out second to get the French record (5)
I believe the answer is:
Here is my best explanation:
'go out' is the definition.
'second to get the french record' is the subsidiary indication.
'second' becomes 's' (common abbreviation**).
'to get' says to put letters next to each other.
'the french' becomes 'le'.
'record' becomes 'ep'.
(Other definitions for sleep that I've seen before include "Wayne _; former Royal Ballet principal dancer", "Slumber", "Natural state of unconscious rest", "snooze", "''... that knits up the ravell'd sleeve of care'' (Macbeth)", "Be dormant", "crash", "Nap", "Drop off" and "Produced (egg)".)