Crossword Genius

Both arduous and difficult within (4)

Ross

I believe the answer is:

hard

I'm a little stuck... Click here to teach me more about this clue!

'within' is the definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I can't see?

'both arduous and difficult' is the wordplay.
'HARD' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for hard that I've seen before include "Tough - laborious" , "badly" , "impenetrable" , "Newspaper's sure" , "Resentment" .)

I've seen this clue in The Mirror.
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