Just to explain furhter - any artist who has exhibited at Burlington House, where the Royal Academy is based, is entitled to put the initials RA after their name. Yuou often find that when the term artist is used in a clue, the setter will mean this, although obviously not always. By the same token, if a setter uses the word doctor in a clue it can denote GP, MB, MO or even that the answer is an anagram! Hope that clarifies things.