What is referred to by 'a strenuous effort'?

Based on the clue 'a streetcar is an abstract ballet inspired by the ...', what is the answer? Based on the clue 'a streetcar named desire earned this actress her 2...', what is the answer? What is referred to by 'a streetcar'? What is referred to by 'a strengthless athenian'? Based on the clue 'a strict often literal adherent to a faiths tenets...', what is the answer? Based on the clue 'a strict one of these 15 letter words tends to int...', what is the answer? What is referred to by 'a strict rule enforcer'? What is associated with: a strike by this union shut down ups for 15 days in 1997?