Fine example of how species endlessly evolved (9)
I believe the answer is:
showpiece
'fine example' is the definition.
(I've seen this before)
'how species endlessly evolved' is the wordplay.
'endlessly' means to remove the last letter.
'evolved' is an anagram indicator (the order of letters changes or evolves).
'how'+'species'='howspecies'
'howspecies' with its final letter removed is 'howspecie'.
'howspecie' with letters rearranged gives 'SHOWPIECE'.
'of' acts as a link.
(Other definitions for showpiece that I've seen before include "main feature" , "fine specimen of its kind" , "Impressive exhibit" , "Item of work presented for display" , "good example" .)