Christmas gift that could create genuine anger (12)
I believe the answer is:
frankincense
'christmas gift that' is the definition.
'frankincense' can be an answer for 'christmas gift' (I've seen this before). I am unsure of the rest of the definition.
'create genuine anger' is the wordplay.
'create' says to put letters next to each other.
'genuine' becomes 'frank' (synonyms).
'anger' becomes 'incense' (to incense is make angry).
'frank'+'incense' is 'FRANKINCENSE'.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for frankincense that I've seen before include "gift second to gold?" , "Birthday gift" , "One of three wise men's gifts" , "One of the gifts of the Magi" , "Nativity gift; aromatic tree resin" .)