Infrequent production of new models (6)

I believe the answer is:

seldom

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

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

'production of new models' is the wordplay.
'models' can be anagrammed to 'SELDOM'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for seldom that I've seen before include "Once in a blue moon" , "Alluvium" , "Not 21" , "Infrequent" , "Not often, infrequently" .)

I've seen this clue in the Evening Standard.

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