Pinhead

7 clues
Dolt
Dope
Dunce
Nitwit
Nimrod
Dullard
Birdbrain
Similar answers:
Achirpinginsect
Acidhead
Acidheads
Addapinchofsalt
Addleheaded
Adroopinthebucket
Adropinsnails
Adropintheocean
Agentroomheader
Agrippina
Agroupofpinkfleshed
Ahead
Aheaddress
Aheadforfigures
Aheadof
Aheadofhare
Aheadoflettuce
Aheadofonestime
Aheadofschedule
Aheadofthecurve