An EAVESDROPPER is someone who listens to private conversations without the knowledge or permission of the people involved. The term 'EAVESDROPPER' can be broken down into two crossword solutions: ICICLE (6 letters) and RAIN (4 letters). ICICLE refers to the icicles that form on the eaves of a roof, which is where an EAVESDROPPER would typically stand to listen in on conversations. RAIN is a reference to the fact that eavesdroppers often stand outside in the RAIN in order to remain undetected.