Frown about rolling around in dirt (7)
I believe the answer is:
grimace
'frown' is the definition.
(both can mean a displeased expression)
'rolling around in dirt' is the wordplay.
'rolling' says the letters should be written backwards.
'around' becomes 'ca' (circa).
'in' means one lot of letters goes inside another.
'dirt' becomes 'grime' (grime can mean dirt or mud).
'ca' back-to-front is 'ac'.
'ac' going into 'grime' is 'GRIMACE'.
'about' acts as a link.
(Other definitions for grimace that I've seen before include "Wry look" , "(Make) a wry face" , "Facial contortion expressive of pain or disgust" , "Dour" , "look disgusted" .)