I didn't think this was as hard as teammates suggested. Anyway, you're in 4S on the ♣2 lead (2nd/4th, low from Hxx).
If it helps, there was a noticeable hesitation on the other side of the screen, you're not sure if it was partner or RHO tanking though (or both).
The defense will switch to hearts as soon as possible (unless there is an obvious set).