Crossword puzzle clue "it's hard as nails"

Here are the possible solutions for it's hard as nails clue

Answer
Clue
Relevancy
emery
Clue
It's hard as nails
Definition
to coat with emery (a polishing powder)
simile
Clue
'Hard as nails,' for one
Hard as nails, for one
steely
Clue
Hard as nails
acer
Clue
One who nails a test, say
Definition
(Latin) a plant of the maple genus
aces
Clue
Nails
Nails a test
Nails, as a test
Definition
ACE, to serve an unreturnable shot e.g. in tennis

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