Finish the asparagus off, darling (5)

I believe the answer is:

sugar

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

'darling' is the definition.
(thesaurus)

'finish the asparagus off' is the wordplay.
'SUGAR' is hidden back-to-front within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sugar that I've seen before include "Basic sweetener" , "Sweeten" , "White crystalline sweetener" , "Damn" , "Sweet white substance" .)

I've seen this clue in the Evening Standard.

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