Leave the stream followed by a big animal (7)
I believe the answer is:
gorilla
'big animal' is the definition.
'gorilla' can be an answer for 'animal' (I've seen this before). I'm not certain of the 'big' bit.
'leave the stream followed by a' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'the stream' becomes 'rill' (rill is a kind of stream).
'followed by' says to put letters next to each other.
'go'+'rill'+'a'='GORILLA'
Can you help me to learn more?
(Other definitions for gorilla that I've seen before include "huge beast" , "Large chest-beating ape" , "African great ape" , "Ape - aggressive muscleman" , "Powerful great ape" .)