Hide satchels in kingdom's capital (8)
I believe the answer is:
helsinki
'capital' is the definition.
(capital of Finland)
'hide satchels in kingdom's' is the wordplay.
'hide' indicates a hidden word.
'HELSINKI' can be found hidden inside 'satchels in kingdoms'.
(Other definitions for helsinki that I've seen before include "foreign capital" , "Sikh line (anag)" , "Main city of Finland" , "Is he link to a European city?" , "Finnish capital" .)