Mrs. Taylor's class - Hidden Communication solution
by Ron Sweet

Reading the Across answers in order tells the solver to take the first letter of each clue to get a "secret" message, which is: HAVE A HAPPY THANKSGIVING!

Mrs. Taylor's class HC solution grid

Across
1T + HE
3INITIAL (LATIN II anag)
6LETTERS (2 defs)
7FOR ("FOUR" hom)
8EACH (ACHE anag)
10C(L)UE
12SPELL (2 defs)
13pOUT
16THE
17SECRET (CRETE'S anag)
18MESSAGE (SEA GEMS anag)
Down
1TILTERS (LITTERS anag)
2EAT (TEA anag)
3notICED
4IN + SECT
5LORE (hidden)
7FLU ("FLEW" hom)
9CHEWERS (CREW SHE anag)
11A + L(ASK)A
14USER (RUSE anag)
15ACRE (RACE anag)
16aTOMs