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AC/DC for bisexual is indeed in Chambers. I imagine that it is rather derogatory these days and would not be used, but this puzzle is from some time ago.

You do need to know that I is the symbol for current (in the physics sense) for the full wordplay.
I stands for Current Intensity (C was already taken as the symbol for capacitance).

I recall my physics professor told us that his lab assistant was called Ivy Watts, I doubt this was true, but I’ve always remembered it for the formula IV = W.

Colmm and Jono, thanks. I'm delighted if and when I can solve clues with no scientific knowledge necessary!

Tnx Tyke51,

A clever cryptic clue.

Next, 23, 15D: End lack of preparation for traditional measure. ANS: Folk Dance.

Parse please.

Anagram (preparation) "end lack of"

Colmm, just an anagram (preparation) of 'end lack of', and a measure can mean a dance.

Tnx Chrise and Malone,

Never saw the anagram although I did know measure and dance.

Next, 24, 19A: In first- class condition after amputation here. ANS: Clinic

I get Cl and in, but the rest?

Nick,is the condition (in good nick) and it's amputated by cutting off the last letter.

Tnx Malone,

So simple !!

Next, 24, 14D: Shouted at, having drawn off beer under the counter. ANS: Barracked.

I get shout, and bar / counter, but the rest?

rack /rak/
transitive verb
To draw off from the lees

lees /lēz/
plural noun
Sediment that forms during the fermentation or aging of an alcoholic liquor

Tnx Jono,

My list of verbs for rack did not include draw off beer.