Yes! Yeoman injured fast buck! (4,5)
I believe the answer is:
easy money
'fast buck' is the definition.
'easy money' can be an answer for 'buck' (I have seen 'Quick buck' mean 'easy money' so perhaps 'buck' could also mean 'easy money'). I'm not sure about the 'fast' bit.
'yes yeoman injured' is the wordplay.
'injured' indicates anagramming the letters.
'yes'+'yeoman'='yesyeoman'
'yesyeoman' is an anagram of 'EASY MONEY'.
Can you help me to learn more?
(Other definitions for easy money that I've seen before include "return without difficulty" , "Good pay for little work" , "effortless gain" , "Quick buck" , "Effortlessly-obtained cash" .)