Chemistry World

[dvdfrwthr]

27a chemist ran around being extremely furtive
3d refers to the tourist attractions on the radio
25d princess doubting characteristics
33d principal lass hiding heavenly body

[dvdfrwthr]

Thanks Captain2.
That just leaves 56d unsolved.

[Etch]

What letters are placed for 56d?

[dvdfrwthr]

I think ?Ag??N??D. The only elements I can think to fit are T, Ar & Ro.

[scrunge999]

I think it’s the French artist Fragonard:

https://en.wikipedia.org/wiki/Jean-Honoré_Fragonard

Anagram of GRAND, FOR and A (‘original art’)

The elements are Fr, Ag, O, N and Ar, plus the D for Deuterium.

[dvdfrwthr]

Thank you Scrunge999.
I didn’t try hard enough.

[Captain2]

You gave us the wrong letter pattern too, dvdfrwthr; still it's Christmas so we'll let you off. ;0)))

[dvdfrwthr]

Thanks to everyone who helped me. I managed the quick crossword on my own.
Happy Christmas