Crossword Genius

Another name for Big Bertha, very quiet at last (5)

Ross

I believe the answer is:

krupp

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'another name for big bertha very' is the definition.
I can't judge whether this defines the answer.

'quiet at last' is the wordplay.
'quiet' becomes 'pp' (music symbol for 'pianissimo').
'at' says to put letters next to each other (I've seen this in other clues).
'last' becomes 'kru' (I can't justify this - if you can you should believe this answer much more).
'pp' put after 'kru' is 'KRUPP'.

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I've seen this clue in the Evening Standard.
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