The crossword solution for the term 'NOT A GOOD FIT' is 'TANTRUM'. A TANTRUM is an outburst of strong emotion, usually anger or frustration, that is often accompanied by crying and screaming. It is typically seen in young children, but can also occur in adults. It is usually a sign that the person is feeling overwhelmed and unable to cope with the situation. In the context of the phrase 'not a good fit', it implies that the person is not suited for the particular situation or environment.