Extremely hazy about program's content (5)
I believe the answer is:
happy
'content' is the definition.
(content can mean happy or pleased)
'extremely hazy about program's' is the wordplay.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'about' means one lot of letters goes inside another.
'program' becomes 'app' (type of computer program).
'hazy' with its middle taken out is 'hy'.
'hy' enclosing 'app' is 'HAPPY'.
(Other definitions for happy that I've seen before include "Contented" , "Delighted" , "Well-pleased" , "Fortunate - joyful" , "Cheerful - dwarf" .)