Following sting, eccentric means to pay (5,4)
I believe the answer is:
smart card
'to pay' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'following sting eccentric' is the wordplay.
'following' means one lot of letters go next to another.
'sting' becomes 'smart' (I've seen this in another clue).
'eccentric' becomes 'card' (card can mean an eccentric person).
'smart' put next to 'card' is 'SMART CARD'.
'means' acts as a link.
Can you help me to learn more?
(Other definitions for smart card that I've seen before include "financial authorisation" , "used to carry out financial transactions" , "piece of plastic that stores data" , "Piece of plastic with micro-processor" , "ID with microprocessor built in" .)