This form appears to be entirely unattested elsewhere. It may be possible to read some of the –sce variants as –sté and so link them to the article for netteté but the –sse variants cannot be so altered.
s.
1cleanliness, purity:
(
s.xiii2/4; MS: s.xiii2
)
esguardez el mirur: Tut i verrez vostre figure, Vostre nettesce, vostre ordure
192
(
s.xiiiex; MS: 1307-15
)
verraie charité ke est clarté e nettesce de quer
154.23
nettesse (s.xiii2/4)