Long sales talk with no pressure (4)
I believe the answer is:
itch
'long' is the definition.
(thesaurus)
'sales talk with no pressure' is the wordplay.
'sales talk' becomes 'pitch' ('pitch' can be a synonym of 'sales talk').
'with no' is a deletion indicator.
'pressure' becomes 'p' (abbreviation).
'pitch' with 'p' taken out is 'ITCH'.
(Other definitions for itch that I've seen before include "Constant desire" , "following seven years in union?" , "It must be scratched" , "Hunger, longing" , "Teasing desire" .)