Gear up, wandering in capital (6)
I believe the answer is:
prague
'capital' is the definition.
(capital of Czechia)
'gear up wandering' is the wordplay.
'wandering' is an anagram indicator.
'gear'+'up'='gearup'
'gearup' is an anagram of 'PRAGUE'.
'in' is the link.
(Other definitions for prague that I've seen before include "Gear up for this European city" , "Capital city of Czech Republic" , "European capital" , "Czech Republic's capital" , "Rather quiet" .)