Ideal, but it can make Pa groan! (7)
I believe the answer is:
paragon
'ideal' is the definition.
(paragon is a kind of ideal)
'it can make pa groan' is the wordplay.
'it can make' is an anagram indicator.
'pa'+'groan'='pagroan'
'pagroan' with letters rearranged gives 'PARAGON'.
'but' acts as a link.
(Other definitions for paragon that I've seen before include "Perfect type" , "A model as of virtue" , "An ideal" , "Perfect embodiment of a concept" , "Role model" .)