Moving, doing things (6)
I believe the answer is:
active
I believe this is a double definition.
'moving' is the first definition.
(similar in meaning)
'doing things' is the second definition.
(I've seen this before)
(Other definitions for active that I've seen before include "erupting periodically" , "Working; moving" , "Not extinct (of volcano)" , "kind of voice" , "Moving about, functioning" .)