Crossword Genius

Tom has to dine on sauce (6)

Ross

I believe the answer is:

catsup

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

'sauce' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?

'tom has to dine' is the wordplay.
'tom' becomes 'cat' (I have seen 'A tom ' mean 'cat' so perhaps 'tom' could also mean 'cat').
'has' says to put letters next to each other.
'to dine' becomes 'sup' (synonyms).
'cat'+'sup'='CATSUP'

'on' acts as a link.

Can you help me to learn more?

(Other definitions for catsup that I've seen before include "Relish" , "something saucy from US" .)

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