Propose new packaging area, with a staple for the box (4,5)
I believe the answer is:
soap opera
'the box' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'propose new packaging area with a staple' is the wordplay.
I cannot really see how this works, but
'area' could be 'a' (maths abbreviation) and 'a' is found in the answer.
an anagram of 'propose' is 'sopoper' which is present in the remaining letters.
'a' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for soap opera that I've seen before include "Sentimental TV serial, sounds clean" , "that might involve The Woolpack?" , "TV drama series" , "Everyday drama serial" , "Eg, Coronation Street" .)