Planning ahead, couple take week off (2,2)

I believe the answer is:

up to

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

'off' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for up to that I've seen before include "Incumbent upon" , "working at > till" , "As far as a certain point" , "As many as, though no more" , "Engaged in doing" .)

I've seen this clue in The Telegraph.

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.