Act very inconclusively in town (5)
I believe the answer is:
dover
'town' is the definition.
(I've seen this in other clues)
'act very inconclusively' is the wordplay.
'act' becomes 'do' (to do is to act or execute a task).
'very' becomes 'v' (common abbreviation).
'inconclusively' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'do'+'v'+'er'='DOVER'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for dover that I've seen before include "Kentish port" , "Roved around the English port" , "Cinque Port" , "Kent ferry port" , "The largest English ferry port" .)