US politician swindles island, acquiring Greek drugs (11)

I believe the answer is:

congressman

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'us politician' is the definition.
(I've seen this before)

'swindles island acquiring greek drugs' is the wordplay.
'swindles' becomes 'cons' (con is a kind of swindle).
'island' becomes 'Man' (the Isle of Man is an example).
'acquiring' indicates putting letters inside.
'greek drugs' becomes 'gres' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cons'+'man'='consman'
'consman' enclosing 'gres' is 'CONGRESSMAN'.

Can you help me to learn more?

(Other definitions for congressman that I've seen before include "Member of US legislature" , "US politician" .)

I've seen this clue in The Times.

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