Crossword Genius

Vlad must cut in – Spooner's call-girl makes proposal to the gullible (1,4,1,6,2,4,3)

Ross

I believe the answer is:

i have a bridge to sell you

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

'gullible' is the definition.
I know nothing about this answer so I can't tell whether this works.

'vlad must cut in spooner's call-girl makes proposal to' is the wordplay.
I cannot quite see how this works, but
'vlad' could be 'i' (where the crossword setter is 'Vlad') and 'i' is found within the answer.
'must' could be 'have' (synonyms) and 'have' is found in the answer.
'cut' could be 'abridge' (synonyms) and 'abridge' is located in the answer.
'girl' could be 'elly' and 'elly' is present in the answer.
'to' is present in the answer.
The remaining letters 'sou' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'the' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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