Crossword Genius

Occur beyond collapsed pier (9)

Ross

I believe the answer is:

transpire

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Hindu.
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