Dealer good enough to take out his heartless brother (6)
I believe the answer is:
broker
'dealer' is the definition.
(I've seen this before)
'good enough to take out his heartless brother' is the wordplay.
I cannot really understand how this works, but
'good' could be 'ok' and 'ok' is found within the answer.
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for broker that I've seen before include "Negotiate with" , "He buys and sells for others - say stocks" , "intermediary" , "Insurance or investment agent" , "One acts as an agent for others in buying and selling" .)