Opens act with flourish: a crowning achievement? (8)
I believe the answer is:
capstone
'flourish a crowning achievement?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'opens act' is the wordplay.
'opens act' can be anagrammed to 'CAPSTONE'.
But, I am not sure how this is indicated.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for capstone that I've seen before include "What's put on wall" , "Part of coping" , "Piece on top of wall, etc" .)