Alan of "M*A*S*H” (4)
'alan of mash' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alda that I've seen before include "Alan ---, M.A.S.H. actor" , "American actor" .)
(Other definitions for alan that I've seen before include "- Ayckbourn, English playwright" , "Boy's name" , "A.A. Milne's first name" , "-- Ayckbourn, English dramatist" , "One of Robin Hood's men was - a Dale" .)