See a vehicle in a county town (5)
I believe the answer is:
cavan
'county town' is the definition.
'cavan' can be an answer for 'town' (I have seen 'Irish town' mean 'cavan' so perhaps 'town' could also mean 'cavan'). I'm unsure of the 'county' bit.
'see a vehicle' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'vehicle' becomes 'van' (van is a kind of vehicle).
'c'+'a'+'van'='CAVAN'
'in a' is the link.
Can you help me to learn more?
(Another definition for cavan that I've seen is " Irish town".)