Model turned stern admits wearing a shoe (7)
I believe the answer is:
trainer
'shoe' is the definition.
(I've seen this before)
'model turned stern admits wearing a' is the wordplay.
'model' becomes 't' (Ford Model T car).
'turned' says the letters should be written backwards.
'stern' becomes 'rear' (synonyms).
'admits' means one lot of letters goes inside another.
'wearing a' becomes 'ni' (I can't explain this - if you can you should believe this answer much more).
'rear' going around 'ni' is 'reniar'.
'reniar' backwards is 'rainer'.
't'+'rainer'='TRAINER'
Can you help me to learn more?
(Other definitions for trainer that I've seen before include "Coach - item of footwear" , "Machine that simulates the conditions of flying a plane" , "Running shoe" , "Casual 11 ac" , "Sports/casual shoe" .)