Possible Clues:

• Might bowler be let go so peremptorily? (2,3,4,2,1,3)
• Immediately suggestive of boater going down? (2,3,4,2,1,3)
• Quickly and without warning...as illustrated by this puzzle's long down answers
• Father had potato cooked just like that (2,3,4,2,1,3)
• That poor fathead beaten up without provocation (2,3,4,2,1,3)
• With only slight provocation ... as suggested by some black squares in this puzzle
• With the slightest provocation, and how four answers in this puzzle make sense
• Immediately ... or where this puzzle's five circled squares appear?
• Without warning, and where the starred answers get tricky
• As a bowler's jettisoned with little justification? (2,3,4,2,1,3)