A poor clue if, in the absence of crossers, there are at least three valid answers - GREEK, ROYAL and GREEN (blue)!
A friend worked at a high-tech audio factory in Burnley that was visited by Prince Philip (the same day that the Queen opened the Queen's Wing at the school where I taught in Blackburn). Apparently someone erected a large banner on the factory wall saying
"AMS welcomes Phil the Greek"!