Civic leader getting old in prison (5)
I believe the answer is:
caged
'in prison' is the definition.
(I've seen this before)
'civic leader getting old' is the wordplay.
'leader' says to take the initial letters.
'getting' is a charade indicator (letters next to each other).
'old' becomes 'aged' (similar in meaning).
The initial letter of 'civic' is 'c'.
'c'+'aged'='CAGED'
(Other definitions for caged that I've seen before include "Cooped up" , "Confined behind bars" , "in prison" , "In a zoo?" , "Shut up" .)