Low moment stumbling upon second-rate fish pie place (6,7)

I believe the answer is:

melton mowbray

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'pie place' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'low moment stumbling upon second-rate fish' is the wordplay.
'stumbling' is an anagram indicator.
'upon' is a charade indicator (letters next to each other).
'second rate' becomes 'b'.
'fish' becomes 'ray' (ray is a kind of fish).
'low'+'moment'='lowmoment'
'lowmoment' is an anagram of 'meltonmow'.
'meltonmow'+'b'+'ray'='MELTON MOWBRAY'

Can you help me to learn more?

(Other definitions for melton mowbray that I've seen before include "Centre of stilton" , "Pork pie town" .)

I've seen this clue in The Telegraph.

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