Mean pop star - my money is missing (6)
I believe the answer is:
stingy
'mean' is the definition.
('stingy' can be similar in meaning to 'mean')
'pop star my money is missing' is the wordplay.
'pop star' becomes 'sting'.
'money' becomes 'm' (abbreviation in economics).
'is missing' is a deletion indicator.
'my' with 'm' removed is 'y'.
'sting'+'y'='STINGY'
(Other definitions for stingy that I've seen before include "Tight with money" , "Wasps are" , "Patch of nettles is" , "Mean and grudging" , "reluctant to spend money" .)