ACROSS
13 Winter - - -, festive song (10)
14 Scare a little, make uneasy (7)
15 Beast, creature (6)
16 Colloquial name for champagne (6)
17 and Giant 42 Down Third most popular seasonal song by Slade in 1973 (5,4, 9)
18 Enclosure for a feathered pet (8)
19 Sparkling precious stone (5)
22 Ancient remnants (6)