If I Find the "Objective Clue" with Gloria's Psychic Sensitivity, Does That Reveal the Objective
No Gloria only looks at the cards, they are not revealed. Additionally, clue 1 is always the final clue to be discovered.
The wording on Gloria's Psychic Sensitivity Ability is:

&quot;Action: Once per game, look at all Exploration cards in the room of your choice (you must then return them in the same order).&quot;

The rulebook states (page 9):

Explore Action - The most common action that investigators perform on their turn is Exploring a Room. During setup, the keeper places face-down exploration cards in every room on the game board. Investigators may reveal these cards by performing an explore action in the room.
Clues: These are the cards the investigators a ultimately attempting to discover. These cards have no artwork and are clearly labeled with a large number and a letter in the upper left corner. The number represents the level of the clue (clue 1 is always the final clue to be discovered), while the letter only matters during setup.