Blackberry Cocktail With Gin, Lemon Juice

Puzzle 3 of Happy Hour Piece of Cake Pack

Question is: Blackberry Cocktail With Gin, Lemon Juice

and the answer is: BRAMBLE

Word Meaning:

BRAMBLE — Any of many closely related thorny plants in the genus Rubus including the blackberry and likely not including the raspberry proper.

Definitions from Wiktionary.