Band Aid Charity Single, Do __ It's Christmas?

This page is the CodyCross answer for the clue below from Apothecary, Group 1976, Puzzle 1 (National Formulary).

Question is: Band Aid Charity Single, Do __ It's Christmas?

and the answer is: THEYKNOW

Word Meaning:

THEY — (the third-person plural nominative) A group of entities previously mentioned.

Definitions from Wiktionary.