Financial specialist in car, hard worker and certain winner? (8,6)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Perhaps the setter hopes product placement will be noticed by the Stuttgart marketing department. MERC is your car (hopefully), then H(ard) (worker) ANT, and BANKER is the dead cert filly you bet on to cover your losses on the rest which turn out to be elderly carthorses.