Very positive concession (3)
I believe the answer is:
sop
'concession' is the definition.
(sop is a kind of concession)
'very positive' is the wordplay.
'very' becomes 'so' (I've seen this in other clues).
'positive' becomes 'p'.
'so'+'p'='SOP'
(Other definitions for sop that I've seen before include "Something of no great value given to appease" , "Concession made to pacify troublesome person" , "Propitiatory gift" , "usual way of doing things, initially" , "Concession of philosophy" .)