The term 'ONE WITH TUNNEL VISION' can be summarized as someone who is focused on ONE thing to the exclusion of all else. This person is so focused on their goal that they are unable to see any other possibilities or solutions. The crossword solution for this term is ANT, which is a small insect that is known for its single-mindedness and determination. Ants are often seen marching in a straight line, never deviating from their course, and this behavior is analogous to the TUNNEL VISION of someone who is focused on ONE thing.