Match Helen organized in festival town (10)
I believe the answer is:
cheltenham
'festival town' is the definition.
'cheltenham' can be an answer for 'town' (town in Gloucestershire). I am not sure about the 'festival' bit.
'match helen organized' is the wordplay.
'organized' indicates an anagram.
'match'+'helen'='matchhelen'
'matchhelen' with letters rearranged gives 'CHELTENHAM'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for cheltenham that I've seen before include "Gloucestershire town" , "West Country spa town with racecourse" , "here near the Cotswolds" , "Gloucestershire racecourse" , "English racecourse and spa town" .)