Pass or cross through tip of Easter Island (7)
I believe the answer is:
excrete
'pass' is the definition.
('excrete' can be a synonym of 'pass')
'easter island' is the wordplay.
'easter' becomes 'ex' (I can't justify this - if you can you should give a lot more credence to this answer).
'island' becomes 'crete' (Crete is an example).
'ex'+'crete'='EXCRETE'
'or cross through tip of' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for excrete that I've seen before include "Eliminate (from the body)" , "Defecate" , "Expel (waste) from the body" .)