Agricultural partner was responsible for these detailed figures (5,5,4)
I believe the answer is:
three blind mice
'detailed figures' is the definition.
(mice who are de-tailed in the nursery rhyme)
I cannot understand how the rest of the clue works.
(Other definitions for three blind mice that I've seen before include "Characters in rhyme" , "Nursery Ac" , "tailed by the Dutch?" , "Nursery rhyme" .)