The term 'skinny-dipper like a' can be solved by the crossword solutions 'nude' and 'BARE', both of which have four letters. Skinny-dipping is a recreational activity in which a person swims or bathes in a body of water while nude. It is often done for the purpose of cooling off, relaxation, or as a form of exhibitionism. The terms 'nude' and 'BARE' are used to describe someone who is not wearing any clothing.