Models drunk once in blue moon (6)
I believe the answer is:
seldom
'in blue moon' is the definition.
The definition and answer are not the same part of speech.
'models drunk' is the wordplay.
'drunk' indicates an anagram.
'models' anagrammed gives 'SELDOM'.
'once' acts as a link.
Can you help me to learn more?
(Other definitions for seldom that I've seen before include "Only occasionally" , "Not very often, rarely" , "Alluvium" , "Not often, infrequently" , "Models (anag)" .)