Dare to tackle Iran! Heartily pay (6)

I believe the answer is:

defray

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

'pay' is the definition.
(defraying is a kind of paying)

I can't explain the rest of the clue.

(Other definitions for defray that I've seen before include "clear" , "Provide money for expenses etc" , "Bear the expenses of" , "Provide funds" , "Cover the cost of" .)

I've seen this clue in The Hindu.

Want a hint initially instead of a full solution? Install my app