Plan suggested by medic at the back (5)
I believe the answer is:
draft
'plan' is the definition.
(drafting is a kind of planning)
'medic at the back' is the wordplay.
'medic' becomes 'dr' (doctor).
'at' is a charade indicator (letters next to each other).
'the back' becomes 'aft' (at the back of a ship).
'dr'+'aft'='DRAFT'
'suggested by' is the link.
(Other definitions for draft that I've seen before include "Outline or sketch" , "Rough sketch" , "Formulate" , "Provisional document" , "Preliminary text or plan" .)