Money available I agree, time for booty … (9)
I believe the answer is:
fundament
'booty' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'money available i agree time' is the wordplay.
'money available' becomes 'fund' (I can't explain this - if you can you should believe this answer much more).
'i agree' becomes 'amen' ('amen' might be said to indicate agreement).
'time' becomes 't' (abbreviation).
'fund'+'amen'+'t'='FUNDAMENT'
'for' is the link.
Can you help me to learn more?
(Other definitions for fundament that I've seen before include "seat" , "Underlying basis - foundation" , "bottom" .)