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Source of food decoration using garlic improbably left unadopted (5,5)

Ross

I believe the answer is:

icing sugar

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

'source' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'food decoration using garlic improbably left unadopted' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'sugar' (sugar is a kind of food) and 'sugar' is present in the answer.
'decoration' could be 'icing' (icing is a kind of decoration) and 'icing' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for icing sugar that I've seen before include "Cake covering" , "Sweet powder used on cakes etc" , "Sweet stuff used for cake topping" .)

I've seen this clue in The Independent.
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