Out of place, snooze during sex (5)
I believe the answer is:
inapt
'out of place' is the definition.
(I've seen this before)
'snooze during sex' is the wordplay.
'snooze' becomes 'nap' (synonyms).
'during' indicates putting letters inside.
'sex' becomes 'it' (common euphemism).
'nap' placed within 'it' is 'INAPT'.
(Other definitions for inapt that I've seen before include "Cartoon duck" , "Free from deceit" , "not fit for purpose" , "badly judged" , "Ill-chosen, not suitable" .)