For fear of old Peruvian quarter (2,4)

I believe the answer is:

in case

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

'for fear of old' is the definition.
I can't judge whether this definition defines the answer.

'peruvian quarter' is the wordplay.
'peruvian' becomes 'inca' (the Inca were a historical people of Peru).
'quarter' becomes 'se'.
'inca'+'se'='IN CASE'

Can you help me to learn more?

(Other definitions for in case that I've seen before include "In order to allow for eventualities" , "As a precaution" , "Packed" , "For fear that" , "Where traveller may keep clothes" .)

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.