Sales pitch about a new dog (7)
I believe the answer is:
spaniel
'dog' is the definition.
(spaniel is a kind of dog)
'sales pitch about a new' is the wordplay.
'sales pitch' becomes 'spiel' (spiel can mean a sales pitch or presentation).
'about' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'n'='an'
'spiel' enclosing 'an' is 'SPANIEL'.
(Other definitions for spaniel that I've seen before include "Droopy-eared dog" , "Breed of dog" , "Springer- - -" , "Droopy-ear dog" , "Dog found among the alpines" .)