Crossword Genius

Ring up mutual fund (4)

Ross

I believe the answer is:

loop

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

'ring' is the definition.
(a loop is a ring of material)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for loop that I've seen before include "Shape formed by a closed curve that does not intersect itself" , "Computer subroutine" , "Endless strip of tape" , "going round" , "Contraception device - hearing aid" .)

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