Indicate reasons for exhibition venues (11)
I believe the answer is:
showgrounds
'exhibition venues' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'indicate reasons' is the wordplay.
'indicate' becomes 'show' (showing is a kind of indicating).
'reasons' becomes 'grounds' ('ground' can be a synonym of 'reason').
'show'+'grounds'='SHOWGROUNDS'
'for' acts as a link.
Can you help me to learn more?
(Another definition for showgrounds that I've seen is " locations for outdoor events".)