Clever eccentric might facilitate transactions (5,4)

I believe the answer is:

smart card

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'facilitate transactions' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'clever eccentric' is the wordplay.
'clever' becomes 'smart' (similar in meaning).
'eccentric' becomes 'card' (card can mean an eccentric person).
'smart'+'card'='SMART CARD'

'might' is the link.

Can you help me to learn more?

(Other definitions for smart card that I've seen before include "financial authorisation" , "ID with microprocessor built in" , "Piece of plastic with micro-processor" , "used to carry out financial transactions" , "piece of plastic that stores data" .)

I've seen this clue in The Irish Times.

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