The crossword solution for the term 'FEUD (WITH)' is SPAR. A feud is a long-standing argument or disagreement between two parties, often involving violence. The term 'feud (with)' implies that the two parties are in conflict with each other. The word 'SPAR' can be used to describe a physical altercation between two people, which is often seen in a feud. Therefore, the crossword solution of SPAR for the term 'FEUD (WITH)' is appropriate.