10 across
Weight
gain
shed
in
horse-drawn
carriage
(5)
Weight gain shed in horse-drawn carriage (5)
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The definition is at the end of the clue.
How the clue works
The definition is horse-drawn carriage — a tonga being a light two-wheeled carriage from India. "Weight" gives you TON, and then take "gain" with the letters of "in" shed (removed from inside it), leaving GA, and put them together for your answer.