Sound sleepers make love, getting up around noon (5)
I believe the answer is:
snore
'sound sleepers make' is the definition.
(people snore in their sleep)
'love getting up around noon' is the wordplay.
'love' becomes 'eros' (Greek god of love).
'getting up' shows that the letters should be reversed in order.
'around' means one lot of letters goes inside another.
'noon' becomes 'n' ().
'eros' back-to-front is 'sore'.
'sore' enclosing 'n' is 'SNORE'.
(Other definitions for snore that I've seen before include "Make raucous nasal sound during sleep" , "thing which bores" , "Noise indicating sleep" , "How to keep someone awake while sleeping?" , "Raucous sound while sleeping" .)