Breeder runs many dodgy houses I hesitate to say (10)
I believe the answer is:
nurseryman
'breeder' is the definition.
(someone who breeds plants)
'runs many dodgy houses i hesitate to say' is the wordplay.
'dodgy' indicates anagramming the letters (a dodgy or wrong order of the letters).
'houses' means one lot of letters goes inside another.
'i hesitate to say' becomes 'er' (expression used when hesitating).
'runs'+'many'='runsmany'
'runsmany' with letters rearranged gives 'nursyman'.
'nursyman' going around 'er' is 'NURSERYMAN'.
(Other definitions for nurseryman that I've seen before include "Plant grower and seller" , "fellow whose charges are small?" , "Worker rearing plants" , "one's growing business" , "One who grows plants" .)