Fellow Yankee’s call for attention (3)
I believe the answer is:
hey
'call for attention' is the definition.
'fellow yankee's' is the wordplay.
'fellow' becomes 'he' (I've seen this in other clues).
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'he'+'y'='HEY'
(Other definitions for hey that I've seen before include "Exclamation to call attention" , "Exclamation calling attention" , "Call attracting attention" .)