We've just recently bought a Passion flower @Matthew59 and it's still in its pot ( not as big as yours) until we can find somewhere in the ground for it. It gets early morning sun only and then is in shade for the remainder of the day. So it doesn't bear the brunt of afternoon sun and heat. I water it when it's dry after sticking my finger in the compost to feel what's it's like further down in the pot. I normally give it about about three litres of water per watering. I think you could try moving yours to somewhere cooler and see if that revives it.? Good luck.
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I think you could try moving yours to somewhere cooler and see if that revives it.? Good luck.