Flag tour round Agricola's inner sanctum (9)
I believe the answer is:
tricolour
'flag' is the definition.
(I know that tricolour is a type of flag)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tricolour that I've seen before include "Standard of French perhaps" , "Having or involving three colours" , "French national flag" .)