Made certain emergency department accommodate eccentric nurse (7)
I believe the answer is:
ensured
'made certain' is the definition.
('ensure' can be a synonym of 'make certain')
'emergency department accommodate eccentric nurse' is the wordplay.
'emergency department' becomes 'ed' (this might be a standard abbreviation of which I'm unaware).
'accommodate' indicates putting letters inside.
'eccentric' indicates an anagram.
'nurse' anagrammed gives 'nsure'.
'ed' placed around 'nsure' is 'ENSURED'.
Can you help me to learn more?
(Other definitions for ensured that I've seen before include "guaranteed" , "Make certain of" , "Made certain, clinched" , "Determined" , "Made certain for end user" .)