Satisfy with very little cash stimulus (6)

I believe the answer is:

fillip

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'stimulus' is the definition.
(I know that fillip is a type of positive stimulus)

'satisfy with very little cash' is the wordplay.
'satisfy' becomes 'fill' (synonyms).
'with very little cash' becomes 'ip' (I can't explain this - if you can you should believe this answer much more).
'fill'+'ip'='FILLIP'

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(Other definitions for fillip that I've seen before include "If pill could be used as a stimulant" , "Encouraging boost" , "Encouragement, stimulus" , "'Short, quick stimulus (6)'" , "Spur - incentive" .)

I've seen this clue in The Independent.

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