Reportedly start race for ingredient (4)
I believe the answer is:
'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).
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" .)