Meets again when screened by mirrors (11)

I believe the answer is:

reassembles

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

'meets again' is the definition.
('assembles' can be a synonym for 'meets' so perhaps 'reassembles' is OK for 'meets again')

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for reassembles that I've seen is " Reconvenes".)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app