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26a-Way engine is working off energy (7,3,5 letters)
--t----/---/--e--

23a CIR is not completely round (10 letters)
-------s--

17d Lookers-on without pair of spectacles struggled to find driver's air-tube (7 letters)
--o----

Thanks in advance for you help

26, letting off steam.

17, Snorkel.

23, would semicircle fit?

Thank you rusty for all your answers, much appreciated.

You are welcome!