Pull up a stool (3)
I believe the answer is:
sit
'pull up a stool' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sit that I've seen before include "Pose (for artist)" , "Be sedentary" , "Take a seat; pose" , "Pose for painter" , "(Of bird) stay on nest" .)