22 across
Frequently
to
be
found
in
station
vehicle
(4,3)
Frequently to be found in station vehicle (4,3)
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The definition is at the end of the clue.
How the clue works
The answer is a vehicle with a retractable roof. Take STOP, meaning a station on a railway line, and slot in OFT (a word for "Frequently") after the opening S, giving S-OFT-TOP.