Gullible character gets taken in by young men, extortionists (12)

I believe the answer is:

bloodsuckers

'extortionists' is the definition.

'gullible character gets taken in by young men' is the wordplay.
'gullible character' becomes 'sucker'.
'gets taken in by' means one lot of letters goes inside another.
'young men' becomes 'bloods' (blood is an old-fashioned term for a young man).
'sucker' placed into 'bloods' is 'BLOODSUCKERS'.

(Another definition for bloodsuckers that I've seen is " Parasites".)

I've seen this clue in The Telegraph.

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