Do over American couple snubbed by judge (7)
I believe the answer is:
iterate
'do over american' is the definition.
(iterate can mean to do again in American English)
'couple snubbed by judge' is the wordplay.
'couple' becomes 'item' (I've seen this before).
'snubbed' means to remove the last letter (could historically mean cutting the end off).
'by judge' becomes 'rate' (rating is a kind of judging. I am not sure about the 'by' bit.).
'item' with its last letter removed is 'ite'.
'ite'+'rate'='ITERATE'
Can you help me to learn more?
(Other definitions for iterate that I've seen before include "Utter or perform repeatedly" , "Say again, repeat" , "State repeatedly, say again" , "Repeat, state again" , "Recapitulate" .)