Arrive roughly about lunchtime at the holiday destination (7)
I believe the answer is:
riviera
'the holiday destination' is the definition.
(I've seen this before)
'arrive roughly about lunchtime' is the wordplay.
'roughly' indicates an anagram.
'about' means one lot of letters goes inside another.
'lunchtime' becomes 'I' (one o'clock is I on a clock with Roman numerals).
'arrive' with letters rearranged gives 'rivera'.
'rivera' going around 'i' is 'RIVIERA'.
'at' is the link.
(Other definitions for riviera that I've seen before include "Part of Med coast" , "Subtropical 1 dn area" , "Coastal region with a nice climate" , "Subtropical coastal area" , "I arrive at French holiday area" .)