Eg best case or worst case or wrought-iron case? (8)
I believe the answer is:
scenario
'eg best case or worst case' is the definition.
(as in best-case scenario and worst-case scenario)
'wrought-iron case?' is the wordplay.
'wrought' is an anagram indicator (I've seen this in other clues).
'iron'+'case'='ironcase'
'ironcase' anagrammed gives 'SCENARIO'.
'or' acts as a link.
(Other definitions for scenario that I've seen before include "Event postulation" , "Outline or synopsis of a play" , "Written outline of film, etc" , "Projected plan of action" , "Outline of dramatic work" .)