Occur beyond collapsed pier (9)
I believe the answer is:
transpire
'occur' is the definition.
(thesaurus)
'beyond collapsed pier' is the wordplay.
I cannot quite see how this works, but
an anagram of 'pier' is 'pire' which is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for transpire that I've seen before include "Prove to be so, happen" , "exhale" , "Become known about terrapins" , "Happen[s]" , "revealed" .)