Plan B has it again, Morradoo is correct. Break it into two parts, "morr" and "adoo". The clue said "seems like", because "morr" is not exactly "more" but is similar, and the "something extra" implied that something "more" was added to the "much". The second part of the clue used the convention that in cryptic clues, the letter "o" can be used to represent the number zero "0" (or nothing), so in "adoo" you have "ado about nothing". To misquote the great bard, "more (morr) ado about nothing".
Anyway, back to Plan B. (and to duttonbay's clever list you could add Twelfth Night: waiting for a cancelled train.)