Crossword Genius

A burden describing some clues (6)

Ross

I believe the answer is:

across

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'a burden describing some clues' is the definition.
I can't judge whether this defines the answer.

'a burden' is the wordplay.
'burden' becomes 'cross' (someone's particular burden is their cross).
'a'+'cross'='ACROSS'

Can you help me to learn more?

(Other definitions for across that I've seen before include "Traversing" , "From side to side, like this clue" , "sort of clue?" , "First word in any crossword" , "written like this?" .)

I've seen this clue in The Telegraph.
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