Whirl around in animated dynamism (4)
I believe the answer is:
eddy
'whirl around' is the definition.
(I've seen this in another clue)
'in animated dynamism' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EDDY' is hidden in the letters of 'animated dynamism'.
(Other definitions for eddy that I've seen before include "Whirlwind" , "Twist" , "Swirling current" , "A small whirl of water" , "She founded Christian Science in 1866, d. 1910" .)