People wasting money stop eating chips? On the contrary (9)

'people wasting money' is the definition.

'chips? on the contrary' is the wordplay.
'chips?' becomes 'spalls' (a spall is a chip or fragment of rock).
'on' indicates putting letters inside (as in clothing \'on\' a person).
'the contrary' becomes 'end' (I am not sure about this - if you are sure you should believe this answer much more).
'spalls' placed around 'end' is 'SPENDALLS'.

'stop eating' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.