Swear model falls for b------, ideally (2,4)
I believe the answer is:
at best
'ideally' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for at best that I've seen before include "In the most optimistic situation" , "In the optimum situation" , "Under optimum conditions" , "the most you can expect" , "In the most favourable outcome" .)