Skip wagon - interior is very round (6)
I believe the answer is:
cavort
'skip' is the definition.
(I've seen this before)
'wagon interior is very round' is the wordplay.
I cannot really see how this works, but
'very' could be 'v' (common abbreviation) and 'v' is found within the answer.
'round' could be 'o' (o is a circular letter) and 'o' is located in the answer.
'wagon' could be 'cart' (cart is a kind of wagon) and 'cart' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cavort that I've seen before include "Dance around excitedly" , "Frolic, gambol" , "Prance around" , "Skip" , "Frolic joyfully" .)