Pesters travellers on vacation touring Russian capital (8)
I believe the answer is:
troubles
'pesters' is the definition.
'travellers on vacation touring russian capital' is the wordplay.
'travellers' becomes 'tails' (tail is a kind of traveller).
'on vacation' says to hollow out the word (remove centre letters).
'touring' indicates putting letters inside (touring can mean going round).
'russian capital' becomes 'rouble' (Russian currency).
'tails' with its middle removed is 'ts'.
'ts' enclosing 'rouble' is 'TROUBLES'.
(Other definitions for troubles that I've seen before include "Pack them up in your old kit bag and smile" , "Difficulties, worries" , "Distressing or painful events" , "Problems and difficulties - subtle or what?" , "Old song: 'Pack up your . . . . . . . . In your old kit bag'" .)