Crossword Genius

Use up our large investment on fabulous things (9)

Ross

I believe the answer is:

splendour

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

'investment on fabulous things' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'use up our large' is the wordplay.
I cannot quite understand how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is found within the answer.
'use' could be 'spend' (spending is a kind of using) and 'spend' is present in the remaining letters.
The remaining letters 'our' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for splendour that I've seen before include "Grandeur" , "Spectacle" , "Sumptuous display - Len's proud (anag)" , "Magnificent appearance" , "Brilliance or pomp" .)

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