Intelligence, so to speak (6)
I believe the answer is:
smarts
'intelligence so to speak' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for smarts that I've seen before include "Stings; intelligence (US)" , "Hurts; stings" , "Stings painfully" , "Stings, sounding clever" , "Aged dandies" .)