Sales talk about article for dog (7)
I believe the answer is:
spaniel
'for dog' is the definition.
(spaniel is a kind of dog)
'sales talk about article' is the wordplay.
'sales talk' becomes 'spiel' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'article' becomes 'an' (indefinite article).
'spiel' placed around 'an' is 'SPANIEL'.
(Other definitions for spaniel that I've seen before include "Springer- - -" , "Dog - leaps in (anag)" , "Long-eared dog" , "Dog with drooping ears" , "See 13" .)