Call and follow possum (8)
I believe the answer is:
ringtail
'possum' is the definition.
(I've seen this before)
'call and follow' is the wordplay.
'call' becomes 'ring' (telephone call).
'and' says to put letters next to each other.
'follow' becomes 'tail' (both can mean to chase or pursue).
'ring'+'tail'='RINGTAIL'
(Other definitions for ringtail that I've seen before include "creature" , "Sleepwalker" , "Possum" , "Sort of cat" , "Type of cat" .)