Press more about holding no-good retailer (10)
I believe the answer is:
ironmonger
'retailer' is the definition.
(I know that ironmonger is a type of shopkeeper)
'press more about holding no-good' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'more about holding no good' becomes 'monger' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'iron'+'monger'='IRONMONGER'
Can you help me to learn more?
(Other definitions for ironmonger that I've seen before include "Hardware retailer" , "Dealer in household goods" , "Shopkeeper" , "Seller of metal goods" , "Hardware shop" .)