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Sort of topping month with vermin at home (2,6)

Ross

I believe the answer is:

au gratin

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'sort of topping' is the definition.
The definition suggests an adjective which matches the answer.

'month with vermin at home' is the wordplay.
'month' becomes 'Aug' (abbreviation for August).
'with' is a charade indicator (letters next to each other).
'vermin' becomes 'rat' (rats are vermin).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'aug'+'rat'+'in'='AU GRATIN'

Can you help me to learn more?

(Other definitions for au gratin that I've seen before include "baked with a coating of breadcrumbs" , "Cooked with grated cheese and/or breadcrumbs" , "Covered with breadcrumbs or grated cheese" , "Of cooking, done with crust of melted cheese" , "Of food dish, cooked with crust of melted cheese" .)

I've seen this clue in The Telegraph.
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