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Informal permission to build rescinded after Risk Assessment indicated presence of poisonous gas (5)

Sounds like you got soaked by one of the elements (5)

Is the word FIVES or FIVER ?

or something less obvious?

Republican commercial working for something noxious and gassy (5)

Not about Trump.

Damn him, yes it is.

Noble Rhonda kicked heroin, cycled! (5)

Nurse inhaling trouble gas (5)

RN is US abbrev for nurse

@Paulh - I think we need a hint! I’ve tried applying Scrabble letter values to the words in the search for a pattern, Fibonacci sequences, chemical symbols, vowel replacement, literary connections… all to no avail!

SUPPLEMENTARY CHALLENGE UPDATE

tyke @23 not the answer

I now reveal that paul @3, unless it's a huge coincidence, has deliberately indicated that he has a correct solution. I now invite others to suggest one or both of the two other solutions, one of which is not in every dictionary. In doing so you may also explain your answer. If needed, a further hint will be posted at 0900 on Sunday.

Congratulations, paul. I am glad you have demonstrated that the challenge was not too far fetched.

toast contains As ... arsenic
cliff contains Li ... lithium
radon contains Ra ... radium

are we talking toxic or toxin?

... or Cl for chlorine