Old model, due for exhibit (5)
I believe the answer is:
exude
'exhibit' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.
'old model due' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'model' indicates an anagram.
'due' with letters rearranged gives 'ude'.
'ex'+'ude'='EXUDE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for exude that I've seen before include "Emanate" , "Long-legged wader" , "Ooze out or emit" , "display" , "Show, say, confidence - ooze out" .)