Vehicle found in Washington garage (5)
I believe the answer is:
tonga
'vehicle' is the definition.
(I have seen 'Light vehicle' mean 'tonga' so perhaps 'vehicle' could also mean 'tonga')
'in washington garage' is the wordplay.
'in' indicates a hidden word.
'TONGA' is hidden within 'washington garage'.
'found' acts as a link.
(Other definitions for tonga that I've seen before include "Two-wheeled Indian vehicle" , "Polynesian monarchy, member of the Commonwealth" , "Relatively small" , "part of Polynesia" , "Horse-drawn vehicle" .)