A bit of diplomacy? Nice, but I doubt your motives (5)

I believe the answer is:

cynic

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'i doubt your motives' is the definition.
I can't tell whether this definition defines the answer.

'a bit of diplomacy? nice but' is the wordplay.
'a bit of' says the answer is hidden in the clue.
'CYNIC' is hidden within 'diplomacy nice but'.

Can you help me to learn more?

(Other definitions for cynic that I've seen before include "Pessimist" , "One who believes the worst of people" , "one with little faith in human nature" , "Doubter of others' motives" , "One who knows the cost of everything and the value of nothing" .)

I've seen this clue in The Independent.

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