Be bent on taking a condescending attitude (5)
I believe the answer is:
stoop
'attitude' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stoop that I've seen before include "Lower one's standards" , "Bend the body forwards" , "go on a bender?" , "Hunch" , "Sink" .)