Yes, an inedible 2, chrise.
Re ‘syrup’ - it is a diminution, but one that is so common that it amounts to a synonym in itself in my book. There are other examples but I’m struggling to think of one at the moment.
1 features a homophone (think theatricals) and the solution is what Brits are, rightly or wrongly, known for being good at.
In 3, ‘2s’ is a verb. Cryptic fodder is (1,2) inserted in (3).
12 parses as (5,4) where the 5 is an anagram and the 4 a definition.
Hope the hints help, and glad you’re persisting!