Crossword Genius

A meths product well known to be nonflammable (6)

Ross

I believe the answer is:

thames

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

'be nonflammable' is the definition.
I can't tell whether this defines the answer.

'a meths product well known' is the wordplay.
'a meths' anagrams to 'THAMES'.
Though, I am not clear how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for thames that I've seen before include "capital banker" , "London's river (6)" , "Longest English river" , "Sam the river" , "The Ma's in the river" .)

I've seen this clue in the Evening Standard.
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