Illustration facing title page is perfection, perhaps (12)
I believe the answer is:
frontispiece
'illustration' is the definition.
(I know that frontispiece is a type of illustration)
'is perfection perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'is'+'perfection'='isperfection'
'isperfection' anagrammed gives 'FRONTISPIECE'.
'facing title page' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for frontispiece that I've seen before include "Illustration facing a book's title page" , "Picture at beginning of book" , "Plate" .)