Doctor has kind of food that's in fashion (6)
I believe the answer is:
modish
'that's in fashion' is the definition.
(I've seen this in another clue)
'doctor has kind of food' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'has' says to put letters next to each other.
'kind of food' becomes 'dish' ().
'mo'+'dish'='MODISH'
(Other definitions for modish that I've seen before include "in the latest fashion?" , "Trendy" , "In vogue or fashion" , "I'm shod in the current fashion" , "Fashionable, in style" .)