Clue: Noted prior to supply ideas for opening of abbey (9)
Answer: AFORESAID
Explanation: Definition: Noted prior

[*opening of*] **A**(bbey) + **FOR **+ ***(ideas)** [anag:*supply*] 
 

 
*These are the component parts, but the clue gives ESAID + FOR + A. Even if the "prior" is not part of the definition, that would give FOR + A + ESAID?