Open with anger an original Christmas gift (12)
I believe the answer is:
frankincense
'christmas gift' is the definition.
(gift given to Jesus)
'open with anger' is the wordplay.
'open' becomes 'frank' (synonyms).
'with' means one lot of letters go next to another.
'anger' becomes 'incense' (to incense is make angry).
'frank'+'incense'='FRANKINCENSE'
'an original' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for frankincense that I've seen before include "One of the Magi's gifts" , "Birthday gift" , "Aromatic gum resin - an original Christmas present!" , "present at birth" , "Gift of one of the Magi" .)