Still juggles it in the juggling acts (6)
I believe the answer is:
static
'still' is the definition.
(synonyms)
'juggles it in the juggling acts' is the wordplay.
'juggles' indicates an anagram (I've seen 'juggled' mean this).
'in' indicates putting letters inside.
'the juggling' is an anagram indicator (I've seen this in other clues).
'it' is an anagram of 'ti'.
'acts' anagrammed gives 'stac'.
'ti' inserted inside 'stac' is 'STATIC'.
(Other definitions for static that I've seen before include "Stuck in a traffic jam" , "Noise caused by electrical interferance" , "Not active or moving" , "Constant interference" , "Its cat (anag)" .)