Old article about head of nature programme (6)
I believe the answer is:
agenda
'programme' is the definition.
(agenda is a kind of programme)
'old article about head of nature' is the wordplay.
'old' becomes 'aged' ('aged' can be similar in meaning to 'old'**).
'article' becomes 'a' (indefinite article).
'about' indicates putting letters inside.
'head of' says to take the initial letters.
The first letter of 'nature' is 'n'.
'aged'+'a'='ageda'
'ageda' going around 'n' is 'AGENDA'.
(Other definitions for agenda that I've seen before include "Scheme" , "To-do list" , "List of items for discussion at a meeting" , "Timetable" , "Meet to discuss this" .)