How do I reduce background noise in Final Cut Pro 10.8.1?

I there an easy way to eliminate the background noise? I've recorded an interview with a 'semi-directional' mike in a public space. I didn't have any headphones to monitor the sound so I set the audio recording to auto. The subject's voice is still decent but the mike has picked up a lot of background sound including music, which is distracting. How can I quickly improve the sound quality in FCP? I'm not an advanced FCP user. I'll appreciate any tips that might help me sort this problem.

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