Crossword Genius

Work that is about making capital investment (3,3)

Ross

I believe the answer is:

top hat

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

'work that is about making capital investment' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'work that is about' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'is about' is an insertion indicator.
'op' put within 'that' is 'TOP-HAT'.

Can you help me to learn more?

(Other definitions for top hat that I've seen before include "Formal headgear of lofty sort" , "Formal attire" , "Formal head-wear for a man" , "Film with Astaire and Rogers" , "Fancy lid" .)

I've seen this clue in The Globe and Mail.
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