Sourced in Kandahar is salty, spicy paste (7)
I believe the answer is:
harissa
'paste' is the definition.
(I have seen 'hot paste' mean 'harissa' so perhaps 'paste' could also mean 'harissa')
'sourced in kandahar is salty spicy' is the wordplay.
'HARISSA' is hidden within the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for harissa that I've seen before include "Spicy sauce" , "Hot paste used in North African cuisine -- ass hair (anag)" , "Hot North African sauce" .)