On the street, a loud cry to increase sales? (5)
I believe the answer is:
boost
'increase sales?' is the definition.
'boost' can be an answer for 'increase' (boosting is a kind of increasing). I'm not sure about the 'sales?' bit.
'on the street a loud cry' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the street' becomes 'st' (abbreviation).
'a loud cry' becomes 'boo' (I have seen 'Cry of contempt ' mean 'boo' so perhaps 'cry' could also mean 'boo'. I am not sure about the 'loud' bit.).
'st' put after 'boo' is 'BOOST'.
'to' is the link.
Can you help me to learn more?
(Other definitions for boost that I've seen before include "Uplift" , "Raise" , "Shot in the arm" , "Encourage or increase" , "Promote" .)