Dirty Mind

Today, I was doing a crossword. The clues came in the form of chains of three words, all linked by a single word which was the answer. One of these clues was chain, clip, pump. It had me stumped for AGES. My brain found it difficult to come to terms with the fact that the answer wasn't 'clitoral'.

As it was, the answer was bicycle. Probably took me half an hour to figure it out.