Johnny and Mark could be officially OK (6-5)

I believe the answer is:

rubber-stamp

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

'officially ok' is the definition.
'rubber stamp' can be an answer for 'ok' (thesaurus). I am not sure about the 'officially' bit.

'johnny and mark' is the wordplay.
'johnny' becomes 'rubber' (I am not sure about this - if you are sure you should believe this answer much more).
'and' means one lot of letters go next to another.
'mark' becomes 'stamp' (I have seen 'Imprinted mark' mean 'stamp' so perhaps 'mark' could also mean 'stamp').
'rubber'+'stamp'='RUBBER-STAMP'

'could be' acts as a link.

Can you help me to learn more?

(Another definition for rubber-stamp that I've seen is " Make official".)

I've seen this clue in The Independent.

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