The calm hen gets agitated in an English town (10)
I believe the answer is:
cheltenham
'an english town' is the definition.
'cheltenham' can be an answer for 'town' (town in Gloucestershire). I'm unsure of the 'an english' bit.
'the calm hen gets agitated' is the wordplay.
'gets agitated' indicates an anagram.
'the'+'calm'+'hen'='thecalmhen'
'thecalmhen' anagrammed gives 'CHELTENHAM'.
'in' is the link.
Can you help me to learn more?
(Other definitions for cheltenham that I've seen before include "Gloucestershire racecourse" , "GCHQ location" , "English racecourse and spa town" , "West Country spa town with racecourse" , "Gloucestershire town" .)