The term 'straight man, for a comedian' can be summarized as a person who acts as a FOIL to a comedian. A FOIL is someone who provides contrast to the comedian's jokes and helps to emphasize the comedic timing. The crossword solution for this term is FOIL, which is an acronym for 'Funny Opposite In Line'. This term is often used in comedy routines, where one person plays the straight man and the other plays the comedian. The straight man's role is to provide a serious or realistic reaction to the comedian's jokes, which helps to make the jokes funnier.