Crossword Genius

Over a kiss (6)

Ross

I believe the answer is:

across

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

'over' is the definition.
(synonyms)

'a kiss' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
The remaining letters 'cross' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for across that I've seen before include "ax" , "First word in any crossword" , "...this is 'Number Ten'" , "what follows one here" , "Facing" .)

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