Popular nurse's plan (6)
I believe the answer is:
intend
'plan' is the definition.
(intending is a kind of planning)
'popular nurse's' is the wordplay.
'popular' becomes 'in'.
'nurse' becomes 'tend' (I've seen this before).
'in'+'tend'='INTEND'
(Other definitions for intend that I've seen before include "Have as purpose or plan" , "Mean; propose" , "Aim, plan" , "Mean; aim" , "Purport" .)