Affecting everyone, from one side of the panel to the other (14)

I believe the answer is:

acrosstheboard

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'affecting everyone from one side' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'the panel to the other' is the wordplay.
'panel' becomes 'board' (synonyms).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the other' becomes 'across' (I can't explain this - if you can you should give a lot more credence to this answer).
'the'+'board'='theboard'
'theboard' put after 'across' is 'ACROSSTHEBOARD'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for acrosstheboard that I've seen before include "Without exception" , "in general" .)

I've seen this clue in The Daily Express.

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