Food suggestion contains single error (7)
I believe the answer is:
cuisine
'food' is the definition.
(cuisine is a kind of food)
'suggestion contains single error' is the wordplay.
'suggestion' becomes 'cue' (I've seen this in other clues).
'contains' means one lot of letters goes inside another.
'single' becomes 'I' (one).
'error' becomes 'sin' (a sin is a moral error).
'i'+'sin'='isin'
'cue' going around 'isin' is 'CUISINE'.
(Other definitions for cuisine that I've seen before include "Culinary art" , "Haute . . . . . . . is high-class cooking" , "The food" , "Cooking style characteristic of a place" , "Local cooking style" .)