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Bishop must accept change to obtain loan (8)

r(evolve)r. Not in BRB but a revolver is a revolving line of credit:

http://www.wordnik.com/words/revolver

Or an even more finance-y clue:

Railroad must accept work out to obtain loan (8)

RR for railroad is in Collins; a work out is an informal debt restructuring.

Cycle in Ottawa right now?(10)

It's only -16 C!

Killer's weapon found by turning spouse over, nothing left out. (8)

Not sure if killer's weapon needs a qualifier like "maybe" or "potential" to be a good definition.

spouse = lover, turned
over with nothing left out = ver

Darwin's discovery, after start of research, caused this in biology? (10)

Frequent job-swapper gets fired? (8)

Innovative UK bank, leaders of investing opportunities, spun yarn (13).

MPRS @8
No problem!

Wheel used in game of roulette? (8)

Russian roulette, that is