Crossword Genius

Overthrow towards slip (6)

Ross

I believe the answer is:

coupon

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

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

'overthrow towards' is the wordplay.
'overthrow' becomes 'coup' (I've seen this in another clue).
'towards' becomes 'on' (I am not sure about this - if you are sure you should believe this answer much more).
'coup'+'on'='COUPON'

Can you help me to learn more?

(Other definitions for coupon that I've seen before include "Token" , "Voucher or ticket" , "Entry form" , "means to buy goods" , "betting slip" .)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app