Approve

18 clues
OK
Okay
Pass
Ratify
Say yes
Sanction
Authorise
Authorize
Greenlight
Say yes to
Green light
Give the OK
Rubberstamp
Give the okay
Think well of
Give the nod to
Give the go-ahead
Give the go-ahead to
Similar answers:
Aasinapple
Acapp
Acappella
Acappellazinger
Accentshappen
Accentswillhappen
Accidentshappen
Acthappy
Adamsapple
Adamsapples
Adroveofmartinets
Ahappycamper
Ahappyhanukkah
Ahappynewyear
Aintgonnahappen
Airapparent
Akappacoffee
Alcapp
Alcappuccino
Allhappyfamil