Crossword puzzle clue "difficult to detect perhaps"

Here are the possible solutions for difficult to detect perhaps clue

Answer
Clue
Relevancy
gradual
Clue
Difficult to detect, perhaps
Definition
happening by degrees
alien
Clue
Message sender SETI hopes to detect
Definition
foreign
antiradar
Clue
Like some hard-to-detect missiles
Definition
designed to foil radar
arat
Clue
Smell ___ (detect foul play): 2 wds.
What the dubious detect by odor
Smell _____ (detect wrongdoing)
bitterness
Clue
Host: "Champ, this seemed like a grudge match. Do I detect some ... ___?" Flay: "Well, yeah, he kept calling me 'Flabby Boy'!"
Definition
the state of being bitter
chemicaltest
Clue
Using iodine to detect starch, e.g.

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