Seal of approval for Charlie to snip top off little packet (6)
I believe the answer is:
cachet
'seal of approval' is the definition.
(synonyms)
'top off little packet' is the wordplay.
'top off' becomes 'cap' (I've seen this in another clue).
'little' means to remove the last letter (the word is not quite complete).
'packet' becomes 'chet' (I can't justify this - if you can you should give a lot more credence to this answer).
'cap' with its final letter taken away is 'ca'.
'ca'+'chet'='CACHET'
'for charlie to snip' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cachet that I've seen before include "Official seal on document" , "Kudos" , "French prestige or distinguishing mark" , "Distinctive stamp" , "(Mark of) distinction" .)