Indicate assent (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
nod
'indicate assent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nod that I've seen before include "OK" , "Gesture of assent" , "even Homer sometimes does" , "Gesture; agree" , "Fellow that's set up number 500" .)