Had self-service lit up (7)

I believe the answer is:

flashed

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

'lit up' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe you can see a link between them that I don't see?

'had self-service' is the wordplay.
'service' indicates an anagram (I've seen 'serviced' mean this (to service can mean to repair)).
'had'+'self'='hadself'
'hadself' anagrammed gives 'FLASHED'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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