Start of computer game is second-rate (6)

I believe the answer is:

crummy

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'second-rate' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?

'start of computer game' is the wordplay.
'start of' indicates taking the first letters.
'game' becomes 'rummy' (rummy is a kind of game).
The initial letter of 'computer' is 'c'.
'c'+'rummy'='CRUMMY'

'is' is the link.

Can you help me to learn more?

(Other definitions for crummy that I've seen before include "Dirty and inferior" , "Very bad" , "Poor" , "Inferior (colloq.)" .)

I've seen this clue in The Independent.

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