A witty fellow is someone who is humorous and clever. The term can be broken down into three crossword solutions: WAG (3 letters), PUNSTER (7 letters), and FUNSTER (7 letters). WAG is a slang term for someone who is funny and makes jokes. A PUNSTER is someone who is skilled at making puns, which are jokes that use words with multiple meanings. Finally, a funster is someone who enjoys having fun and making others laugh.