  We analyze out-of-equilibrium fluctuations in a driven spin system and relate
them to the noise of spin susceptibility. In the spirit of the linear response
theory we further relate the noise of susceptibility to a $4$-spin correlation
function in equilibrium. We show that, in contrast to the second noise (noise
of noise), the noise of susceptibility is a direct measure of non-Gaussian
fluctuations in the system. We develop a general framework for calculating the
noise of susceptibility using the Majorana representation of spin-1/2
operators. We illustrate our approach by a simple example of non-interacting
spins coupled to a dissipative (Ohmic) bath.
