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We consider a complete sample of 101810 giants with Gaia DR2 parallaxes$\varpi$ within the red clump domain of the Hertzsprung-Russell diagram in thespace cylinder with a radius of 700 pc around the Sun and a height of$|Z|=1800$ pc. We use the Gaia DR2 $G_\mathrm{BP}$, $G_\mathrm{RP}$ and WISE$W3$ photometry. We describe the spatial variations of the modes of theobservables $G_\mathrm{BP}-G_\mathrm{RP}$, $G_\mathrm{RP}-W3$,$G_\mathrm{BP}+5+5\,\log_{10}\varpi$, $G_\mathrm{RP}+5+5\,\log_{10}\varpi$, and$W3+5+5\,\log_{10}\varpi$ by extinction and reddening in combination withlinear vertical gradients of the intrinsic colours and absolute magnitudes ofthe red giant clump. The derived clump median absolute magnitude in $W3$ agreeswith its recent literature estimates. The clump median intrinsic colours andabsolute magnitudes in $G_\mathrm{BP}$ and $G_\mathrm{RP}$ are derived for thefirst time at a precision level of 0.01 mag. We confirm the reliability of thederived clump absolute magnitudes, intrinsic colours, and their verticalgradients by comparing them with the theoretical predictions from PARSEC, MISTand BaSTI isochrones. This leads us to the median age and [Fe/H] of the clumpwithin $|Z|<1.7$ kpc from the Galactic mid-plane as$(2.3\pm0.5)+(3.2\pm1.6)\,|Z|$ Gyr and $(-0.08\pm0.08)-(0.16\pm0.07)\,|Z|$ dex,respectively, where $Z$ is expressed in kpc. These results agree with recentempirical and theoretical estimates. Moreover, all the models give similarage-metallicity relations by use of our results in the optical range. Thederived extinctions and reddenings across the whole dust half-layer below orabove the Sun converge to the reddening $E(B-V)=0.06$ mag by use of the mostreliable extinction laws.

{\it Gaia} DR2 giants in the Galactic dust -- I. Reddening across the whole dust layer and some properties of the giant clump