Performer one at rest moved around (7)
I believe the answer is:
artiste
'performer' is the definition.
(artiste is a kind of performer)
'one at rest moved around' is the wordplay.
'one' becomes 'i' (Roman numeral).
'moved' is an anagram indicator.
'around' indicates putting letters inside.
'at'+'rest'='atrest'
'atrest' is an anagram of 'artste'.
'i' put inside 'artste' is 'ARTISTE'.
(Other definitions for artiste that I've seen before include "'Public performer, dancer or singer (7)'" , "Professional performer" , "Performers" , "A sitter for a performer" , "Entertainer, singer or dancer" .)