Crossword Genius

Open and happy face (2,5)

Ross

I believe the answer is:

up front

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

'open' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'happy face' is the wordplay.
'happy' becomes 'up' (I've seen this in other clues).
'face' becomes 'front' (synonyms).
'up'+'front'='UP-FRONT'

'and' is the link.

Can you help me to learn more?

(Another definition for up front that I've seen is " Honest - paid in advance".)

I've seen this clue in The Guardian.
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