for this you wear first the 1h and shield and put cleric in first slot in your infentary and activate weapon swith (make at your and party buffs the phy and mag def buffs on) then it should work.
the prob is, if you switch the weapon again, the phy and mag def buffs on you will disappear.
but those on your PT mates will be there, but i hope in the PT is a clericer, so you don t need to make both jobs
for solo lvling are skins enought and from cleric you just use holy spell and holy rec. devision