Winter vehicle currently parking in Berkshire town (10)
I believe the answer is:
snowplough
'winter vehicle' is the definition.
(I've seen this before)
'currently parking in berkshire town' is the wordplay.
'currently' becomes 'now' (right now).
'parking' becomes 'p' (abbreviation on road signs).
'in' means one lot of letters goes inside another.
'berkshire town' becomes 'slough' (I've seen this before).
'now'+'p'='nowp'
'nowp' inserted inside 'slough' is 'SNOWPLOUGH'.
(Other definitions for snowplough that I've seen before include "Winter vehicle" , "Winter road clearer" , "Vehicle seen in bad weather" , "move to stop slide?" .)