Crossword Genius

FA rubbish about clubs mogul (3,3)

Ross

I believe the answer is:

fat cat

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

'mogul' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'fa rubbish about clubs'' is the wordplay.
'rubbish' becomes 'tat' (low-quality items or material).
'about' indicates putting letters inside.
'clubs'' becomes 'c' (abbreviation used in card games such as bridge).
'tat' placed around 'c' is 'tcat'.
'fa'+'tcat'='FAT CAT'

Can you help me to learn more?

(Other definitions for fat cat that I've seen before include "Moneybags as an obese feline" , "Wealthy person like obese feline" , "Wealthy person like obese beline" , "(Obscenely) wealthy businessman" , "Someone (undeservedly?) rich in business" .)

I've seen this clue in The Sun.
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