Enemy dragon destroyed for extra cash (6,5)
I believe the answer is:
danger money
'extra cash' is the definition.
The definition suggests a singular noun which matches the answer.
'enemy dragon destroyed' is the wordplay.
'destroyed' indicates an anagram.
'enemy'+'dragon'='enemydragon'
'enemydragon' anagrammed gives 'DANGER MONEY'.
'for' is the link.
Can you help me to learn more?
(Other definitions for danger money that I've seen before include "Extra pay for risky job" , "Payment for taking risks" , "Extra pay for risk-taker" , "Extra payment on account of risk" , "Extra payment for hazardous working" .)