Clear time to sunbathe on vacation (5)
I believe the answer is:
erase
'clear' is the definition.
(I've seen this in another clue)
'time to sunbathe on vacation' is the wordplay.
'time' becomes 'era' (era is a kind of time).
'on vacation' suggests removing the centre (after the inside letters have vacated the word).
'sunbathe' with its centre removed is 'se'.
'era'+'se'='ERASE'
(Other definitions for erase that I've seen before include "Take out" , "Eliminate" , "Obliterate" , "Put out of mind" , "Kill" .)