Computing speed making concert a failure (8)

I believe the answer is:

gigaflop

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'computing speed' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'concert a failure' is the wordplay.
'concert' becomes 'gig' (I've seen this in another clue).
'failure' becomes 'flop' (flop is a kind of failure).
'gig'+'a'+'flop'='GIGAFLOP'

'making' is the link.

Can you help me to learn more?

(Other definitions for gigaflop that I've seen before include "PDQ, relatively speaking" , "Massive calculation" , "Speed of computer operation" .)

I've seen this clue in The Daily Express.

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