Programme information held by a girl (6)
I believe the answer is:
agenda
'programme' is the definition.
(agenda is a kind of programme)
'information held by a girl' is the wordplay.
'information' becomes 'gen' (gen is a kind of information).
'held by' means one lot of letters goes inside another.
'a girl' becomes 'ada'.
'gen' inserted inside 'ada' is 'AGENDA'.
(Other definitions for agenda that I've seen before include "Programme of business" , "Meet to discuss this" , "List of items to be done" , "List of items to be discussed" , "Matters to be addressed" .)