Given a hint about turning up with classic sidekick? (3,2,2)
I believe the answer is:
put on to
'classic sidekick?' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'given a hint about turning up' is the wordplay.
'given a hint' becomes 'tonto' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters go next to another.
'turning' says the letters should be written backwards.
'up' in reverse letter order is 'pu'.
'tonto' put after 'pu' is 'PUT ON TO'.
'with' acts as a link.
Can you help me to learn more?
(Another definition for put on to that I've seen is " Make (a person) aware of (something)".)