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Reportedly start race for ingredient (4)

Ross

I believe the answer is:

sago

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'race for ingredient' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'reportedly start' is the wordplay.
'reportedly' becomes 'sa' (I can't explain this - if you can you should give a lot more credence to this answer).
'start' becomes 'go' (synonyms).
'sa'+'go'='SAGO'

Can you help me to learn more?

(Other definitions for sago that I've seen before include "Starchy grain used in desserts" , "Starchy pudding cereal" , "Powdery starchy food" , "Edible palm starch" , "Edible powdery starch" .)

I've seen this clue in The Mirror.
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