Open my den’s container to make a purchase (5,5)

I believe the answer is:

spend money

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

'make a purchase' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'open my den's container' is the wordplay.
'open my den's' can be anagrammed to 'SPEND MONEY'.
But, I'm unsure how this is indicated.

'to' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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.