Exotic product brought back from Ragusa (5)

I believe the answer is:

sugar

I'm a little stuck... Click here to teach me more about this clue!

'exotic product' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'brought back from ragusa' is the wordplay.
'SUGAR' is hidden backwards in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sugar that I've seen before include "Argus (anag.)" , "Sweet white substance" , "Sweeten" , "Damn" , "rotter!" .)

I've seen this clue in the Evening Standard.

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