Entertained by churchmen, delightful scientific monk (6)
I believe the answer is:
mendel
'monk' is the definition.
(Mendel is an example)
'entertained by churchmen delightful scientific' is the wordplay.
'entertained by' says the answer is hidden in the clue.
'MENDEL' can be found hidden inside 'churchmen delightful scientific'.
(Other definitions for mendel that I've seen before include "Scientific monk; lend me (anag.)" , "heredity expert" , "Austrian monk and geneticist" .)