Fullest

6 clues
Maximum
Most complete
Most bounteous
Most jam-packed
Greatest extent
Max, so to speak
Similar answers:
Abeautifulmind
Abeautifulmink
Abeautifulminx
Abeautifulrind
Abeautifulwind
Ablest
Achillesteendon
Achillesten
Achillestendon
Achillestendons
Afistful
Afistfulofdollars
Afull
Afulldisclosure
Afullhouse
Afulltankofgas
Ahandful
Alestake
Allpowerful
Almostfull