Article pretty sharp-witted? (5)
I believe the answer is:
acute
'sharp-witted?' is the definition.
(thesaurus)
'article pretty' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'pretty' becomes 'cute' (I've seen this before).
'a'+'cute'='ACUTE'
(Other definitions for acute that I've seen before include "Sharp as of mind - or pain" , "(Of an angle) less than 90 degrees" , "Sharp, angle or mind" , "Very perceptive, having sharp mind" , "Severe, penetrating" .)