And to anyone who doesn’t really know where to start with cryptic crosswords, there are essentially two key things (and lots of lesser conventions) to know: (1) the answer is almost always a synonym (or example) of the word / phrase at either the beginning or the end of the clue; and (2) loads of the answers are essentially just anagrams of bits of the clue - it’s just a case of getting used to which words indicate that you should be looking for an anagram.
To take 1 Across as an example (because people already got the answer):
(Part 1) “Bordeaux red” is the phrase we’re looking for a straightforward synonym for/example of; and
(Part 2) the rest of the clue (“Treacle endlessly mistaken”) is essentially a more cryptic way of expressing the same answer: you take the end off “treacle” to make “treacl” and then you find an anagram of this (the word “mistaken” is the indication here that you’re looking for an anagram… anything like “wrong” “changed” “drunken” etc. tends to indicate an anagram).
The cryptic bit (i.e. Part 2 above) can be a bit hard to see at first, so most people just try to think of options for Part 1 that have the right number of letters, and then see whether they can figure out the secondary, cryptic bit as a way of essentially confirming that their Part 1 guess was correct.