Swarmkeeper
Hero
No, it clearly fits under:
Investigation.When you look around for clues and make deductions based on those clues, you make an Intelligence (Investigation) check. You might deduce the location of a hidden object, discern from the appearance of a wound what kind of weapon dealt it, or determine the weakest point in a tunnel that could cause it to collapse. Poring through ancient scrolls in search of a hidden fragment of knowledge might also call for an Intelligence (Investigation) check.
Making deductions based on observed clues is Intelligence (investigation).
Not so "clearly". Might be better to say: Making deductions based on observed clues is often but not always Intelligence (investigation).
What @Bawylie said.
Also this...
Variant: Skills with Different Abilities (PHB p175)
Normally, your proficiency in a skill applies only to a specific kind of ability check. Proficiency in Athletics, for example, usually applies to Strength checks. In some situations, though, your proficiency might reasonably apply to a different kind of check. In such cases, the DM might ask for a check using an unusual combination of ability and skill, or you might ask your DM if you can apply a proficiency to a different check.
So, not out of the question to call for a Wisdom (Investigation) check in such a situation.