Centre of mint sweet? (8)

I believe the answer is:

bullseye

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This clue might be a double definition.

'centre of mint' is the first definition.
'bullseye' can be an answer for 'centre' (I've seen this before). I am not certain of the 'of mint' bit.

'sweet?' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for bullseye that I've seen before include "What may regard rival stock" , "A sucker" , "window" , "Gold" , "faithful literary hound > master shot" .)

I've seen this clue in The Daily Express.

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