Crossword Genius

Old sitcom crush (4)

Ross

I believe the answer is:

mash

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This could be a double definition.

'old sitcom' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'crush' is the second definition.
(synonyms)

Can you help me to learn more?

(Other definitions for mash that I've seen before include "food for animals" , "Potato dish" , "Crush, potatoes say" , "Sausages' traditional partner" , "Crush into a soft, pulpy state" .)

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