The incorrectly spelled word is:

 Gaurmet

The correct spelling is "Gourmet." "Gourmet" refers to a person who has refined taste and interest in high-quality food and drink.

The other options are spelled correctly:

• Retrospect: Refers to looking back or reflecting on the past.
• Magnanimous: Describes a person who is generous, forgiving, and noble in character.
• Clandestine: Refers to something done secretly or in a concealed manner.