Circumnavigate round figure in a plane (6)
I believe the answer is:
circle
This clue might be a double definition.
'circumnavigate' is the first definition.
(thesaurus)
'round figure in a plane' is the second definition.
'circle' can be an answer for 'round' (synonyms). I am not sure about the 'figure in a plane' bit.
Can you help me to learn more?
(Other definitions for circle that I've seen before include "Move around (something)" , "Curved closed line" , "Cycle - enclosure" , "London Underground line represented in yellow" , "Theatre seating tier" .)