Managing loan debt, sell valuable sporting trophy (8,4)

I believe the answer is:

lonsdale belt

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

'trophy' is the definition.
(I've seen this before)

'managing loan debt sell valuable sporting' is the wordplay.
'loan debt sell' anagrams to 'LONSDALE BELT'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lonsdale belt that I've seen before include "Boxer's British title prize" , "British boxing prize" , "British boxing award" , "Nobel stalled (anag) -- boxing award" , "Boxing trophy" .)

I've seen this clue in The Independent.

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