Daring others to get involved in hard bargaining (5,7)
I believe the answer is:
horse trading
'hard bargaining' is the definition.
(I've seen this before)
'daring others to get involved' is the wordplay.
'to get involved' is an anagram indicator.
'daring'+'others'='daringothers'
'daringothers' anagrammed gives 'HORSE-TRADING'.
'in' acts as a link.
(Other definitions for horse trading that I've seen before include "Ordering hats (anag) -- ordering quadrupeds?" , "Hard and shrewd bargaining" , "part of stable business?" , "Hard bargaining (at yearling sales?)" .)