i'd say stick with the facts. if you pled guilty and received a deferred sentence, just say so. if you get into 'well, i wasn't really guilty but couldn't afford to fight it...' then i think you'll only hurt your application. as long as this wasn't a violent crime, just stick to the facts.
if you sound like you're trying to weasel your way out of personal responsibility for your actions, i'd imagine the ad comms would not look favorably on your situation.