1. Faithful old part-time Triple Alliance (4) - leal.
2. Oh dear! Don’t close both concert halls (4) - odea.
3. Flyer made out of coffee box and string (4,7) - java sparrow.
4. It’s dark and labour-intensive work without an anvil (10) - enterobius? (i'm sure this is wrong. it's a subtractive anagram but i can't find one to match the definition).
5. They revive some swimmers with sex appeal and leave leader. Some others are placed outside (8,5) - smelling salts.
i think #2 is my favourite (if i read the clue in a sightly camp voice), good start to 2015 Jolan. thank you.