Crossword Genius

A centre on the other side (6)

Ross

I believe the answer is:

across

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

'on the other side' is the definition.
(I've seen this before)

'a centre' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
The remaining letters 'cross' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for across that I've seen before include "Clues like this" , "Clue with solution not going in the direction of this one!" , "what follows one here" , "From side to side of (something)" , "Horizontally" .)

I've seen this clue in The Independent.
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