That was my thought too. - It's been mixing with all the fibres and dust from the clutch and makes a nasty sticky mess.that won't drain out of the bottom.Looks like a leak from the clutch slave from the oil trail, if its gearbox oil just sniff it as it stinks
Strangely enough, that's why mine came out. - It was slipping from the leaking clutch fluid, which then destroyed the friction material... which then got wedged in the cover plate so the clutch wouldn't release:could account for the random clutch slippage I used to get