Great Dublin back consumed by shocking standard seen in Croke Park (10)
I believe the answer is:
grandstand
'back consumed by shocking standard seen in croke park' is the definition.
I can't tell whether this defines the answer.
'great dublin' is the wordplay.
'great' becomes 'grand' (I've seen this before).
'dublin' becomes 'stand' (I can't explain this - if you can you should give a lot more credence to this answer).
'grand'+'stand'='GRANDSTAND'
Can you help me to learn more?
(Other definitions for grandstand that I've seen before include "Terraced block of seats commanding the best view of a sporting event" , "Show off in America" , "Racecourse structure" , "From which spectators watch" , "Main area for race spectators" .)