Actor Alda (4)
I believe the answer is:
alan
'actor alda' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alan that I've seen before include "- Bennett, English actor, dramatist, writer" , "Boy" , "- Bennett, English dramatist, author" , "A.A. Milne's first name" , "Lana (anag.), man's name" .)