Just after one on Thursdays, visiting temple (4,4)

'just' is the definition.
Both the answer and definition are adverbs. Perhaps you can see a link between them that I don't see?

'one on thursdays visiting temple' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'after' acts as a link.

Can you help me to learn more?