Crossword Genius

Make arrangements to get to a matinee but don't arrive together (3,2,1,4)

Ross

I believe the answer is:

one at a time

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

'together' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'make arrangements to get to a matinee but don't arrive' is the wordplay.
'to a matinee' anagrams to 'ONE AT A TIME'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for one at a time that I've seen before include "Individually" , "Singly" , "A-team, I note, travelling separately" .)

I've seen this clue in The Irish Times.
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