Like fast food? Perhaps given porridge to eat at first riles one (4-5)
I believe the answer is:
stir-fried
'like fast food? perhaps given porridge to eat' is the definition.
I can't judge whether this definition defines the answer.
'first riles one' is the wordplay.
I cannot quite see how this works, but
an anagram of 'first' is 'stirf' which is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
The remaining letters 'red' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'at' is the link.
Can you help me to learn more?
(Other definitions for stir-fried that I've seen before include "Cooked by whisking rapidly in hot pan" , "Cooked quickly over high heat" , "Drifter is attracted to food whisked in pan" , "Cooked in a wok" , "Drifter is given food cooked and whisked in pan" .)