Puzzle 4

Firstly; at the beginning

San __, northern Spanish resort, a foodie mecca

Catch someone off-guard

Young plants

Block-building adventure computer game

Brass instruments with slide

BMX __, stunt riding that's a 2020 Olympic sport

Anthony Burgess, A __ Orange

Funny word for nonsense

Clifford the __; animated scarlet canine

Major volcanic explosions

Finds, unearths

Writers of fiction books

Deluge of snow; risk to skiers

Pure AU, not just plated