Apt to be banked (8)
I believe the answer is:
inclined
'apt to' is the definition.
(thesaurus)
'be banked' is the wordplay.
'be' becomes 'incline' (inclining is a kind of being).
'banked' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'incline'+'d'='INCLINED'
Can you help me to learn more?
(Other definitions for inclined that I've seen before include "Leaned towards" , "Sloping - likely" , "Tending" , "Sloped or disposed" , "At an angle" .)