Lemur’s call when encountering shadow (8)
I believe the answer is:
ringtail
'lemur's' is the definition.
(type of lemur)
'call when encountering shadow' is the wordplay.
'call' becomes 'ring' ('ring' can be a synonym of 'call').
'when encountering' is a charade indicator (letters next to each other).
'shadow' becomes 'tail' (tailing is a kind of shadowing).
'ring'+'tail'='RINGTAIL'
(Other definitions for ringtail that I've seen before include "Type of cat" , "creature" , "Sort of cat" , "Possum" , "Sleepwalker" .)