Persuasive, though half-stolen, quote rewritten (8)
I believe the answer is:
eloquent
'persuasive' is the definition.
(I know that persuasive can be written as eloquent)
'half-stolen quote rewritten' is the wordplay.
'half' indicates taking half.
'rewritten' is an anagram indicator.
'stolen' cut in half is 'len'.
'len'+'quote'='lenquote'
'lenquote' with letters rearranged gives 'ELOQUENT'.
'though' acts as a link.
(Other definitions for eloquent that I've seen before include "Using language fluently and expressively" , "Clearly expressive" , "Fluent in the use of words" , "Good at speaking" , "Using language fluently and imaginatively" .)