Climb to a shelf at 10' (may be best to belay here if the sea is a bit lively), then follow the crack.
Location
This is on the left side of the crag in a bay which has a black, undercut slab at its back (Slippery Slab). Zig Zag takes the obvious zig-zag crack up the centre of the steep wall on the L of this bay. Lowish tide needed, as this part of the crag gets wave-washed.