Grand National scene isn't a female ruff (7)
I believe the answer is:
aintree
'grand national scene' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'isn't a female ruff' is the wordplay.
'isn't' becomes 'aint' (non-standard version of 'isn't').
'a female ruff' becomes 'ree' (I've seen this before).
'aint'+'ree'='AINTREE'
Can you help me to learn more?
(Other definitions for aintree that I've seen before include "Merseyside racecourse" , "6 National course" , "Trainee in Grand National venue" , "Home of the Grand National" , "Liverpool racecourse" .)