coal tar

[rika-geert]

ingredient in common coal tar wood preserver

[Jimifleemin]

I think Creosol is what you are looking for. It would help if you also post the name of the crossword, clue number, and number of letters. Thanks.

[arriviste]

Daily Telegraph General Knowledge Crossword
Saturday Aug 1

Seven letters: C-R- - - L

C from iConoclast
R from calcitRiol
L from bLastoderm

[factor-fiction]

I'd go for Creosol.
So your R is in the wrong place

[arriviste]

Seven letters: C-R- S - L

C from iConoclast
R from calcitRiol
S from Sweetheart
L from bLastoderm

The "R" has to be the third letter!
Perhaps there is an alternative spelling to "creosol"?

[factor-fiction]

What is the clue for your answer of calcitriol, and what letters do you have for it?

[arriviste]

"Essential nutrient which helps prevent rickets, more commonly called Vitamin D"

C - L - I - - - O -

C from cyniC
L from saLvation
I from Iota
O from ransOme

[factor-fiction]

Calciferol

[JoolsTwo]

Calciferol

[factor-fiction]

That makes your R an E and means CREOSOL fits