Sees lions moving around without a sound (9)
I believe the answer is:
noiseless
'without a sound' is the definition.
('sound' can be 'noise' (a noise is a sound) so maybe 'without a sound' can be ''noiseless')
'sees lions moving' is the wordplay.
'moving' indicates an anagram (letters are moved around).
'sees'+'lions'='seeslions'
'seeslions' with letters rearranged gives 'NOISELESS'.
'around' is the link.
(Other definitions for noiseless that I've seen before include "Lionesses (anag) - making no sound" , "with a silencer?" , "Silent, quiet" , "Mum" , "unsound?" .)