Athlone prepared to show spirit (7)
I believe the answer is:
ethanol
'spirit' is the definition.
(I know that spirit can be written as ethanol)
'athlone prepared' is the wordplay.
'prepared' indicates an anagram.
'athlone' is an anagram of 'ETHANOL'.
'to show' is the link.
(Other definitions for ethanol that I've seen before include "intoxicating stuff" , "Form of alcohol" , "volatile flammable substance" , "Ethyl alcohol" , "constituent for a dram?" .)