I don't think much grid staring is needed, just enough to see where the the extra answers can go, still forming real words. The setter has been very kind to solvers in that respect.
Group A clues are fairly straightforward. The first one is a non-standard plural meaning banks. For the second, Bradford's lists the word for 'swaggered', and the definition for the third is in the last two words.
There are two possible answers for 31. Trust me to see the wrong one first and get into a real muddle.