Sales patter (5)
I believe the answer is:
spiel
'sales patter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spiel that I've seen before include "Glib story" , "Salesman's glib patter" , "Piles (anag.)" , "Glib style of talk associated with salesmen" , "Plausible line of talk" .)