With online scam over, tightwad endlessly cut spending (9)
I believe the answer is:
economise
'with online scam over tightwad endlessly cut spending' is the definition.
I can't judge whether this defines the answer.
'with online scam over tightwad endlessly' is the wordplay.
'with' indicates putting letters inside.
'online' becomes 'on' (similar in meaning).
'scam over' becomes 'eco' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tightwad' becomes 'miser' (synonyms).
'endlessly' means to remove the last letter.
'on' placed into 'eco' is 'econo'.
'miser' with its final letter taken away is 'mise'.
'econo'+'mise'='ECONOMISE'
Can you help me to learn more?
(Other definitions for economise that I've seen before include "cut costs" , "cut services" , "Scrimp" , "Cut back on expenses, be thrifty" , "budget" .)