Counterpart I see in uniform by medical department (10)
I believe the answer is:
equivalent
'counterpart' is the definition.
(thesaurus)
'i see in uniform by medical department' is the wordplay.
'see' becomes 'v' (Latin 'vide', used to direct a reader to a source).
'in' indicates putting letters inside.
'uniform' becomes 'equal' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'medical department' becomes 'ENT' (abbreviation for Ear, Nose and Throat department).
'i'+'v'='iv'
'iv' put inside 'equal' is 'equival'.
'equival'+'ent'='EQUIVALENT'
(Other definitions for equivalent that I've seen before include "Interchangeable" , "corresponding" , "Equal" .)