Have just enough for a very loud or deafening opening (6)
I believe the answer is:
afford
'have just enough for a very loud or deafening opening' is the definition.
I can't judge whether this definition defines the answer.
'a very loud or deafening opening' is the wordplay.
'very loud' becomes 'ff' (musical abbreviation).
'opening' says to take the initial letters.
The first letter of 'deafening' is 'd'.
'a'+'ff'+'or'+'d'='AFFORD'
Can you help me to learn more?
(Other definitions for afford that I've seen before include "Provide; be able to pay for" , "Able to bear the cost of" , "Be able to buy" , "Have enough money to pay for" , "Yield!" .)