Hi Jolan.
Another great set of clues. Here is my stab at them:
1. Faithful old part-time Triple Alliance (4) – LEAL? (In clue – old Scots word meaning faithful)
2. 2. Oh dear! Don’t close both concert halls (4)- ODEA? (Oh and dear without endings – “don’t close”, gives Odea, concert halls)
3. Flyer made out of coffee box and string (4,7) JAVA SPARROW? (Coffee – Java, Box – spar and row – string gives Java Sparrow – a flyer)
4. It’s dark and labour-intensive work without an anvil (10) TENEBRIOUS? (Subtractive anagram- “labour intensive” without “anvil” gives tenebrious- dark)
5. They revive some swimmers with sex appeal and leave leader. Some others are placed outside (8,5) SMELLING SALTS? (Some swimmers – Ling (plural) with sex appeal – SA and leave leader- L. Placed outside this are other swimmers- Smelts, giving Smel Ling SA L ts- which revive)
Thanks again.
AB