Crossword Genius

Poster with a pleasant message? (3-6)

Ross

I believe the answer is:

pen-friend

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

This clue could be a double definition.

'poster' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'a pleasant message?' is the second definition.
The definition suggests a singular noun which matches the answer.

'with' acts as a link.

Can you help me to learn more?

I've seen this clue in The Sun.
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