Benevolent, suitable character, head of department (4-7)
I believe the answer is:
good-natured
'benevolent' is the definition.
(thesaurus)
'suitable character head of department' is the wordplay.
'suitable' becomes 'good' ('good' can be similar in meaning to 'suitable').
'character' becomes 'nature' (I've seen this before**).
'head of' suggests taking the first letters.
The initial letter of 'department' is 'd'.
'good'+'nature'+'d'='GOOD-NATURED'
(Other definitions for good-natured that I've seen before include "Warm-hearted" , "Kind, unselfish" , "Kind, friendly and patient" .)