Crossword Genius

Frank's happy to start firing a gun (4,2)

Ross

I believe the answer is:

open up

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

'start firing a gun' is the definition.
I can't judge whether this defines the answer.

'frank's happy' is the wordplay.
'frank' becomes 'open' (synonyms).
'happy' becomes 'up' (I've seen this in other clues).
'open'+'up'='OPEN UP'

'to' is the link.

Can you help me to learn more?

(Other definitions for open up that I've seen before include "Speak freely and without restraint" , "Speak freely or unlock door" , "speak his heart" , "Begin to take shots" , "become less cloistered" .)

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