Soup's good! Idiot ignoring starter (5)
I believe the answer is:
gumbo
'soup's' is the definition.
(gumbo is a kind of soup)
'good idiot ignoring starter' is the wordplay.
'good' becomes 'g' (abbreviation).
'idiot' becomes 'dumbo' (I've seen this before).
'ignoring starter' means to remove the first letter.
'dumbo' with its first letter taken off is 'umbo'.
'g'+'umbo'='GUMBO'
(Other definitions for gumbo that I've seen before include "Spicy soup; okra" , "Patois" , "Okra; spicy Cajun dish" , "Thick soup" , "Spicy Cajun soup" .)