In Model T, avoided part of Mississippi for example (5)
I believe the answer is:
delta
'mississippi for example' is the definition.
(Mississippi Delta is an example)
'in model t avoided part' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DELTA' can be found hidden inside 'model t avoided part'.
'of' acts as a link.
(Other definitions for delta that I've seen before include "Estuary area where river has split" , "River mouth in the Greek alphabet" , "Wing shape; Greek D" , "Daedalus started with this" , "Greek letter in the shape of a triangle" .)