There's nothing in a subtle hint to make you get the idea (3,2)
I believe the answer is:
hit on
'get the idea' is the definition.
I can't judge whether this definition defines the answer.
'there's nothing in a subtle hint to make' is the wordplay.
'there's nothing' becomes 'o' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'a subtle hint' becomes 'n' (I can't justify this - if you can you should believe this answer much more).
'to' means one lot of letters go next to another (I've seen this in other clues).
'make' becomes 'hit' (synonyms).
'n' put after 'hit' is 'hitn'.
'o' inserted within 'hitn' is 'HIT ON'.
'you' acts as a link.
Can you help me to learn more?
(Other definitions for hit on that I've seen before include "Try to get off with" , "Discover; single out" , "Discover, think of" , "Make advances to (US)" , "Discovered suddenly or, in modern slang, made advances towards" .)