Indulged by wearing uniforms I'd later bother keeping (10)

I believe the answer is:

luxuriated

I'm a little stuck... Click here to teach me more about this clue!

'indulged' is the definition.
(indulge can mean to luxuriate in something)

'by wearing uniforms i'd later bother keeping' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.

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