Under restraint is a term used to describe a situation in which someone or something is being held back or restricted. In this context, the crossword solutions INHIBITED (9 letters), LEASHED (7 letters), and ONALEASH (8 letters) all refer to the idea of being restrained. INHIBITED means to be prevented from doing something, while leashed and on a leash both refer to the idea of being tied up or held back by a physical restraint such as a rope or chain.