Known for portraying Gunner Jonathan "Paderewski" Graham in the 1970s BBC comedy series It Ain't Half Hot Mum, Clegg also appeared in episodes of Are You Being Served? and Dad's Army.
He first appeared on television in a 1961 episode of the BBC series Dixon of Dock Green.
He appeared in a 2003 film based on the P.D. James detective novel Death in Holy Orders.
He was born in India to English parents. His marriage to television actress Mavis Pugh lasted from 1959 until Pugh's death in 2006.
He and Windsor Davies were both in all eight seasons of It Ain't Half Hot Mum.