MB BS Newcastle 1971, MRCP 1974, MD 1979.
Clague was registrar in Newcastle before being appointed senior registrar in rheumatology for the North West Regional Health Authority in 1976. Clague was awarded a Medical Research Council training fellowship in rheumatology and was honorary senior registrar at the University of Manchester and MRI. In 1980, he was appointed consultant rheumatologist at MRI. Clague later became consultant rheumatologist at Withington Hospital Manchester before being appointed consultant physician in rheumatology and geriatrics at Nobles Hospital, Isle of Man.