The term 'SMALL GROUSE' can be broken down into two crossword solutions: NIT (3 letters) and QUIBBLE (7 letters). NIT is a small, wingless insect that feeds on the blood of mammals, including humans. It is also used as a slang term to describe a person who is overly critical or nitpicks. QUIBBLE is an argument or complaint about a minor detail or point of disagreement. It is often used to avoid discussing the main issue at hand.