Code kept badly concealed (8)

I believe the answer is:

pocketed

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'concealed' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

'code kept badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'code'+'kept'='codekept'
'codekept' anagrammed gives 'POCKETED'.

Can you help me to learn more?

(Other definitions for pocketed that I've seen before include "Stole; potted" , "Pouched" , "Trousered" .)

I've seen this clue in The Sun.

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