Lost at Sea(rch)

Solution

After solving the clues and finding the words in the grid, a few things become apparent:

1. The words come in pairs that overlap at the start or end of each word.
2. The overlapping letters are A–I, giving us something to order the pairs by.
3. Their angles form valid flag semaphores.

Clue	Word	Order	Semaphore	Letter
First module by JerryEris	IKEA	A	NW.N	T
Module with [...] alchemical symbols	ASTROLOGY
First word of modded holdable [...]	BOMB	B	SW.NW	I
Indicator [...] used as unicorn rule	BOB
First module by SL7205	LOGIC	C	N.S	D
Second word of KTaNE developer	CRATE
Last solvable module [...]	PASSWORD	D	SW.S	A
Possible label on The Button	DETONATE
Button on The Swan [...]	EIGHT	E	SW.NE	L
Common first word in module names	THE
Variant of Backgrounds	FAULTY	F	NE.E	W
Starting element from Creation	FIRE
Tan____s, Nono____, and Ana____s	GRAM	G	SW.S	A
____lock and ____ Matching	GRID
Abbreviation for Flamanis’s third module	MAH	H	N.SE	V
First modded needy	MATH
Defender of Human Resources	YOSHI	I	S.NE	E
1st word of 2nd module LeGeND made	ICE

Reading the semaphores in the order given by the intersecting letter yields the solution.

TIDAL WAVE