Refreshment places for which more oats may be ordered (8)

I believe the answer is:

tearooms

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'refreshment places' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

'which more oats may be ordered' is the wordplay.
'more oats' anagrams to 'TEAROOMS'.
Though, I am not clear how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Another definition for tearooms that I've seen is " Small restaurants".)

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