Fine for secreting manuscript in city overseas (4)
I believe the answer is:
omsk
'city overseas' is the definition.
(Russian city)
'fine for secreting manuscript' is the wordplay.
'fine' becomes 'ok' (synonyms).
'for secreting' means one lot of letters goes inside another (secrete can mean to hide or stow away).
'manuscript' becomes 'ms' (abbreviation for manuscript).
'ok' placed around 'ms' is 'OMSK'.
'in' is the link.
(Other definitions for omsk that I've seen before include "City in Siberia" , "Russian place" , "Womble" , "Russian city" , "City of Asian Russia" .)