Criminal Stan grapples with Greg (8)

I believe the answer is:

gangster

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

'criminal' is the definition.
(I know that gangster is a type of criminal)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gangster that I've seen before include "Crook" , "One of a group of violent criminals" , "Member of a mob like Al Capone" , "Typical Cagney role" , "Hoodlum" .)

I've seen this clue in The Sun.

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