Actress filling sugar bowls and cigar boxes (5)

I believe the answer is:

garbo

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

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

'filling sugar bowls and cigar boxes' is the wordplay.
'GARBO' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for garbo that I've seen before include "Old film actress" , "film star? Yes and no" , "Famous film actress" , "Swedish actress who wanted to be alone" , "Female player once" .)

I've seen this clue in The Sun.

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