What does し means here?

いささか この件に‬ ‪執着しすぎだと思うぞ
Okay, so I am little confused about the usage of し here. I know 執着 means obsession and すぎだ means too much(correct me if I’m wrong) But what does し implies?

3 comments
  1. What is the backward 5? I can’t find it on the hiragana paper that I’m studying on

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