The wild lion's caged, all right, when you call on (4,2)
I believe the answer is:
look in
'call on' is the definition.
(thesaurus)
'the wild lion's caged all right when you' is the wordplay.
I cannot really understand how this works, but
'right' could be 'ok' (both are affirmative answers) and 'ok' is located in the answer.
an anagram of 'lion' is 'loin' which is present in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for look in that I've seen before include "Make a short visit" , "Chance to participate" .)