Show off War Horse - the type that's not well done (4)
I believe the answer is:
rare
'not well done' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives occasionally mean the same thing.
'show off war horse the type' is the wordplay.
'off' indicates named letters should be taken away.
'the type' is an anagram indicator.
'war'+'horse'='warhorse'
'warhorse' with 'show' removed is 'arre'.
'arre' with letters rearranged gives 'RARE'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Seldom seen or met" , "Choice - lightly cooked - thin" , "not dense" , "like Ben Jonson, Jack Young thought" , "Not easily come by like undercooked meat" .)