Crossword clues for the word: INSTIR The word INSTIR has appeared as an answer to at least 8 crossword clues on different crossword puzzles. Crossword clues for INSTIR Showing 1 to 8 of 8 results Clue(s) "Doing time, colloquially" "Jailed, slangily" "Locked up, slangily" Behind bars Behind bars, slangily Doing time Finishing a sentence, say Serving a sentence