Hereof

10 clues
Legalese adverb
Concerning this
Of this (legalese)
...upon receipt ___
Lawyer's "concerning this
Elsewhere in this contract
. . . upon the receipt ___
Concerning this, to lawyers
Concerning this, in legalese
Concerning this, in legalspeak
Similar answers:
Aattheraces
Abeliasherman
Abidebytherules
Abolisher
Abother
Aboutfaceoff
Abouther
Aboveallothers
Abovetheweather
Abowlofcherries
Abraceofbirds
Abraceofdentists
Abrother
Abrothertheres
Absenceof
Absenceofalice
Absenceofmalice
Absenceofmallets
Absenceofmind
Absenceofmotion