Reduction of dimple maybe with cosmetic filler (9)

I believe the answer is:

decrement

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'reduction' is the definition.
(I've seen this before)

'dimple maybe with cosmetic filler' is the wordplay.
'dimple maybe' becomes 'dent'.
'with' indicates putting letters inside.
'cosmetic filler' becomes 'creme' (I am not sure about this - if you are sure you should believe this answer much more).
'dent' going around 'creme' is 'DECREMENT'.

'of' is the link.

Can you help me to learn more?

(Other definitions for decrement that I've seen before include "Reduction, diminution" , "Lost amount" .)

I've seen this clue in The Times.

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