Tough clue

First a couple of answers are outstanding. The answer to ‘bottom tier’ is, of course, ‘shoelace’ (did you notice how putting ‘of course’ in there completely alters what you mean to say. It implies that you are thick if you did not get the answer straight away). Not my intention at all; for reasons see below!
The outstanding clue solution is to ‘O’ I’ve never done it before’ which I will not actually tell you just yet because I gave you an incorrect letter count! The answer is two words of 5 and 8 letters. That’s Mr Thicky no 1.
Mr Thicky number 2 comes from today’s clue which is COMBINATION LOCKS and the answer has 4 letters (don’t worry I’ve checked). Why thicky, thicky? because it took me three days to come up with this clue and I bet it gets cracked within seconds. Oh well. Nobody’s perfect as somebody once said. I blame the heat.

Update and new clue

Hello again

First the solution:
The clue was ‘Head in calls for attention after his first class’
the answer is HOI POLLOI
Well, ‘calls for attention’ is OIS i.e oi (as in Oi you) with head in i.e POLL (another term for head as in Polling which is a head count) all following his start H (first letter of ‘his’) gives class (class of people)

The latest clue is ‘O, I’ve never done it before’ 6,9

Today’s clue

No-one has correctly solved the last clue! Some pretty good efforts with sound(ish) reasoning so I will give a litlle hint. The solution has 9 letters. OK?

Hope you are enjoying the summer (or winter, whatever) wherever you are.