Stop tungsten and silver working in estate in Florida (7,5)
I believe the answer is:
station wagon
'estate in florida' is the definition.
(US term for an estate car)
'stop tungsten and silver working' is the wordplay.
'stop' becomes 'station' (eg a stop on a train journey).
'tungsten' becomes 'W' (W is the chemical symbol for tungsten).
'and' is a charade indicator (letters next to each other).
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'working' becomes 'on' (on can mean working or activated).
'station'+'w'+'ag'+'on'='STATION WAGON'
'in' acts as a link.
(Other definitions for station wagon that I've seen before include "US estate car" , "American estate car" , "American vehicle" .)