Only occasionally do we get new models (6)

I believe the answer is:

seldom

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

'only occasionally' is the definition.
(I've seen this before)

'do we get new models' is the wordplay.
'models' can be anagrammed to 'SELDOM'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for seldom that I've seen before include "Models (anag)" , "on rare occasions" , "Alluvium" , "Once in a blue moon" , "Not very often, rarely" .)

I've seen this clue in the Evening Standard.

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