9 across
Old
fighter
happy
I
reversed
schedule
(9)
Old fighter happy I reversed schedule (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Old fighter — that's your definition, the ancient Roman arena type. You've got GLAD meaning happy, then I, and then ROTA (a schedule) reversed to give you ATOR. String those together and the whole thing clicks into place.