Vulgar wiseacre's teaching aids (5,5)

I believe the answer is:

flash cards

I'm a little stuck... Click here to teach me more about this clue!

'teaching aids' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

'vulgar wiseacre's' is the wordplay.
I cannot really understand how this works, but
'vulgar' could be 'flash' (synonyms) and 'flash' is found within the answer.
The remaining letters 'cards' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.