Oscar's wild for clues like this (6)
I believe the answer is:
'clues like this' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for across that I've seen before include "Clues like this" , "Horizontally" , "this venue" , "ax" , "Transversely" .)