The term 'Dead Duck' is a phrase used to describe something that has failed or been rendered useless. The crossword solutions for this term are GONER (5 letters), FAILURE (7 letters), and EASYTARGET (10 letters). GONER implies that the thing in question is no longer alive or functioning, while FAILURE suggests that it has not achieved its intended purpose. EASYTARGET implies that the thing is vulnerable and easily taken advantage of. Together, these solutions paint a picture of something that has been rendered useless and is no longer able to achieve its intended purpose.