Ideal organ arrangement for father (7)
I believe the answer is:
paragon
'ideal' is the definition.
(I know that paragon is a type of ideal)
'organ arrangement for father' is the wordplay.
'arrangement' is an anagram indicator.
'for' says to put letters next to each other (I've seen this in other clues).
'father' becomes 'pa' (pa can mean dad or father).
'organ' with letters rearranged gives 'ragon'.
'ragon' after 'pa' is 'PARAGON'.
(Other definitions for paragon that I've seen before include "A model as of virtue" , "A Model of excellence, perfect person" , "Perfect type" , "Very good example" , "Exemplar" .)