Place that attracts many visitors (5)
I believe the answer is:
'place that attracts many visitors' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mecca that I've seen before include "Mohammed's birthplace" , "Birthplace of the Prophet Mohammed" , "Tourist magnet" , "place with devoted visitors" , "Holy place of Islam" .)