Sorry I'd worked with energy that was minimal (8)

I believe the answer is:

derisory

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'minimal' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'sorry i'd worked with energy' is the wordplay.
'worked with' indicates an anagram.
'energy' becomes 'e' (physics symbol as in E=mc2).
'sorry'+'id'='sorryid'
'sorryid' mixed up with 'e' makes 'DERISORY'.

'that was' acts as a link.

Can you help me to learn more?

(Other definitions for derisory that I've seen before include "worthy of scorn?" , "Scoffing" , "Insultingly small" , "ridiculously little" , "Contemptible" .)

I've seen this clue in The Daily Express.

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