Manually dextrous circus performers (8)
I believe the answer is:
jugglers
'manually dextrous circus performers' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for jugglers that I've seen before include "Manually dextrous circus performers" , "Performers of feats of manual dexterity" , "Performers of tricks of manual dexterity" , "They keep all the balls in the air" .)