Crossword Genius

One set to catch Flashman according to a ventriloquist? (5)

Ross

I believe the answer is:

gully

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

'a ventriloquist?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'one set to catch flashman' is the wordplay.
I cannot really understand how this works, but
'catch' could be 'gull' (synonyms) and 'gull' is present in the answer.
A single letter 'y' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'according to' is the link.

Can you help me to learn more?

(Other definitions for gully that I've seen before include "Deep ditch" , "Water channel; fielding position" , "Rainwater channel" , "Narrow channel - fieldsman" , "In field, position" .)

I've seen this clue in The Independent.
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