Moving under, can do circular steps (5,5)
I believe the answer is:
round dance
'circular steps' is the definition.
(dance steps in a circular pattern)
'moving under can do' is the wordplay.
'moving' indicates an anagram.
'under'+'can'+'do'='undercando'
'undercando' with letters rearranged gives 'ROUND DANCE'.
(Other definitions for round dance that I've seen before include "Steps" , "composition" .)