Encouragement to satisfy mostly with kiss (6)

I believe the answer is:

fillip

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

I don't understand the remainder of the clue.

(Other definitions for fillip that I've seen before include "Incitement" , "'Short, quick stimulus (6)'" , "Stimulus (sounds like a boy!)" , "Encouragement, stimulus" , "As tonic" .)

I've seen this clue in The Times and The Sunday Times.

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