Crossword Genius

Advertisement for mice or clam chowder (10)

Ross

I believe the answer is:

commercial

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

'advertisement' is the definition.
(I know that commercial is a type of advertisement)

'mice or clam chowder' is the wordplay.
'mice or clam' can be anagrammed to 'COMMERCIAL'.
However, I'm not clear how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for commercial that I've seen before include "Greek island" , "in demand?" , "plug" , "TV ad" , "Television advert" .)

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