Can see improvement at gathering (6)

I believe the answer is:

seance

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

'gathering' is the definition.
(I know that seance is a type of get together)

'can see improvement' is the wordplay.
'can see' can be anagrammed to 'SEANCE'.
But, I'm unsure how the anagram is indicated.

'at' is the link.

Can you help me to learn more?

(Other definitions for seance that I've seen before include "Session of spritualists" , "Spiritualists meeting with medium" , "Psychic gathering" , "Spiritualist meeting chaired by medium" , "Meeting held by a medium" .)

I've seen this clue in The Mirror.

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