Flag maker Betsy (4)
I believe the answer is:
ross
'flag maker betsy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ross that I've seen before include "Macbeth nobleman; Antarctic sea" , "US singer Diana" , "Jonathan - - (TV)" , "Macbeth thane; a T. E. Lawrence pseudonym" , "-- Dependency; -- Sea" .)