Time to relax and lie around? Certainly! (7)
I believe the answer is:
leisure
'time to relax' is the definition.
(I've seen this in another clue)
'lie around? certainly' is the wordplay.
'around?' indicates anagramming the letters (I've seen 'around' mean this).
'certainly' becomes 'sure' (synonyms).
'lie' anagrammed gives 'lei'.
'lei'+'sure'='LEISURE'
'and' acts as a link.
(Other definitions for leisure that I've seen before include "casual wear" , "Enjoyment of free time" , "R&R" , "Free time, comfort and convenience" , "Time when not working" .)