Street seller's recipe involved with rice? (5)
I believe the answer is:
crier
'street seller's' is the definition.
(someone advertising their wares in a street)
'recipe involved with rice?' is the wordplay.
'recipe' becomes 'r' (abbreviation in medical prescriptions).
'involved with' indicates anagramming the letters (involved can mean confusing or complex).
'r' with its letters anagrammed with 'rice' makes 'CRIER'.
(Other definitions for crier that I've seen before include "Official making proclamations" , "The town . . . used to shout oyez" , "I call" , "See 8" , "Officer making announcement" .)