Perhaps too involved in punctuation? (10)
I believe the answer is:
apostrophe
'punctuation?' is the definition.
(apostrophe is a kind of punctuation)
'perhaps too involved' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'perhaps'+'too'='perhapstoo'
'perhapstoo' with letters rearranged gives 'APOSTROPHE'.
'in' is the link.
(Other definitions for apostrophe that I've seen before include "address?" , "Sign of omission" , "Mark showing omission of letters" , "in Charley's Aunt ?" , "Where character may be absent" .)