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6 Methadone
1 Stapler
4 Rarefied.

Oh how stupid am I. Thank you. Hopefully that will give me the impetus to finish it!

15 Powerful businessman? ?O???T
14 Travelling around meant carrying correct change
A???D????
25 Old Balt sits in dress circle for opera ????????O

and is 2D Being nimble is talent that's good for ballet, primarily A?I???Y (Agility/Ability/Agilely). Why?

15 Cogent, powerful (just co/business and gent/man).

25 Rigoletto

14. Amendment? Anagram of 'meant' and 'mend', correct.

Agility - i think.
talent = ability
replace the B (ballet, primarily) with G for good.

Wow! Thanks everyone.