Do your bit with sales talk at home (5,2)
I believe the answer is:
pitch in
'do your bit' is the definition.
I can't tell whether this definition defines the answer.
'with sales talk at home' is the wordplay.
'with' is a charade indicator (letters next to each other).
'sales talk' becomes 'pitch' (as in a sales pitch).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'pitch' next to 'in' is 'PITCH-IN'.
Can you help me to learn more?
(Other definitions for pitch in that I've seen before include "Lend a hand" , "play one's part" , "Eat heartily - help with some task - contribute money" , "Get to work" , "Set to work" .)