Tiny bit of a clue (4)
I believe the answer is:
hint
'clue' is the definition.
(I know that clue can be written as hint)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hint that I've seen before include "Tip-off" , "Taste" , "Indirect clue" , "signal" , "CRT screen coating" .)