Alda of M*A*S*H (4)
I believe the answer is:
alan
'alda of mash' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alan that I've seen before include "- Ayckbourn, English playwright" , "Boy" , "-- Sugar, British entrepreneur" , "-- Ayckbourn, English dramatist" , "English name" .)