Person trying to package fancy lace, one responsible for what's on the box (10)
I believe the answer is:
telecaster
'one responsible for what's on the box' is the definition.
I know nothing about this answer so I can't tell whether this works.
'person trying to package fancy lace' is the wordplay.
I cannot really understand how this works, but
an anagram of 'lace' is 'leca' which is within the answer.
'person' could be 'tester' (tester is a kind of person) and 'tester' is present in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for telecaster that I've seen is " one involved in transmission".)