Dance position that's not precise (8)
I believe the answer is:
ballpark
'not precise' is the definition.
(as in a ballpark figure)
'dance position' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'position' becomes 'park' (parking is a kind of positioning).
'ball'+'park'='BALLPARK'
'that's' acts as a link.
(Other definitions for ballpark that I've seen before include "rough area" , "location of diamond" , "(Of a figure) approximate" , "place for pitchers" , "sports arena" .)