Rarely produces new models (6)
I believe the answer is:
seldom
'rarely' is the definition.
(I know that rarely can be written as seldom)
'new models' is the wordplay.
'new' indicates an anagram.
'models' anagrammed gives 'SELDOM'.
'produces' is the link.
(Other definitions for seldom that I've seen before include "Not 21" , "Once in a blue moon" , "Not very often, rarely" , "Not often, infrequently" , "Only occasionally" .)