Suppress key report that's shocking (4)

I believe the answer is:

bang

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'report that's shocking' is the definition.
I can't tell whether this defines the answer.

'suppress key' is the wordplay.
'suppress' becomes 'ban' (I can't explain this - if you can you should believe this answer much more).
'key' becomes 'g' (musical key).
'ban'+'g'='BANG'

Can you help me to learn more?

(Other definitions for bang that I've seen before include "Sudden loud noise (often 'big')" , "Explosion; hair fringe" , "precisely" , "Fringe - report" , "Explosive noise" .)

I've seen this clue in The Sun.

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