Affirmative vote
There are a few possibilities for this:
'affirmative vote' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yes that I've seen before include "3 across" , "Yea" , "Aye" , "That's 27 [RIGHT]" , "Word of affirmation" .)
'affirmative vote' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for yea that I've seen before include "Certainly (archaic)" , "Aye; aye (anag.)" , "-- or nay?" , "Affirmative, colloquially" , "Affirmative vote" .)
'affirmative vote' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for aye that I've seen before include "Entirely one" , "Yes answer in voting" , "Always" , "Positive voting response" , "An affirmative vote" .)