This clue is not a hard thing to bear (6)

I believe the answer is:

across

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

'this clue' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for across that I've seen before include "Traversing" , "As this is entered" , "sort of clue?" , "From side to side, like this clue" , "Clues like this" .)

I've seen this clue in The Times.

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