Crossword Genius

A really good reminder that Christmas is coming (7)

Ross

I believe the answer is:

cracker

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

'a really good reminder' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for cracker that I've seen before include "Great joke - terrible joke's container?" , "Biscuit -- firework" , "An outstanding example of its kind!" , "Xmas table extra" , "Knockout biscuit?" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app