He's forming new gutter, sometimes? (10)

I believe the answer is:

fishmonger

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'he's forming new gutter sometimes?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'he's forming new' is the wordplay.
'new' indicates anagramming the letters.
'hes'+'forming'='hesforming'
'hesforming' is an anagram of 'FISHMONGER'.

Can you help me to learn more?

(Other definitions for fishmonger that I've seen before include "Shopkeeper" , "Shop" , "Seller of salmon, cod, etc" .)

I've seen this clue in The Times.

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