With three i am used for cleaning,
with four I am used to kill,
with five I can be pretty quick,
with all seven I am considered weak.
The slices may not be in the same order
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My answer is:
With three I am used for cleaning,
RAG, a cleaning tool.
With four I am used to kill,
FRAG, a hand grenade.
With five I can be pretty quick,
With all seven I am considered weak.