Father’s scheme for saint (7)
I believe the answer is:
patrick
'saint' is the definition.
(I've seen this before)
'father's scheme' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'scheme' becomes 'trick' (I can't justify this - if you can you should believe this answer much more).
'pa'+'trick'='PATRICK'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for patrick that I've seen before include "-- Moore, astronomer" , "Ireland's patron saint" , "Patron saint who said 'Shoo!' to serpents" , "- - Swayze: film actor" , "Name" .)