  FeSe is an intriguing iron-based superconductor. It presents an unusual
nematic state without magnetism and can be tuned to increase the critical
superconducting temperature. Recently it has been observed a noteworthy
anisotropy of the superconducting gaps. Its explanation is intimately related
to the understanding of the nematic transition itself. Here we show that the
spin-nematic scenario driven by orbital-selective spin-fluctuations provides a
simple scheme to understand both phenomena. The pairing mediated by anisotropic
spin modes is not only orbital selective but also nematic, leading to stronger
pair scattering across the hole and $X$ electron pocket. The delicate balance
between orbital ordering and nematic pairing points also to a marked $k_z$
dependence of the hole-gap anisotropy.
