The most common and most likely answer to this crossword clue is the 5 letter word UMBER
U
M
B
E
R
More clues leading to the result UMBER
- Estuary, except the mouth, is brown
- Brown horse possibly unseats knight
- Brown garment, perhaps not new
- Pigment from river talked of in East London?
- River leaving the capital is brown
- Except for its head, river is brown
- Pigment from ‘ull’s river
- Brownish-coloured river in the East End
- More than one sign of hesitation about black as a colour
- Brown‘s old city entertaining honoured member
Buddy explains!

The straight part
We know that "Earthy tone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case earthy tone = umber.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does UMBER mean?
UMBER noun- A brown clay, somewhat darker than ochre, which contains iron and manganese oxides.
- A grayling.
- A dusky brown African wading bird (Scopus umbretta) allied to the shoebill and herons; a hamerkop.
- To give a reddish-brown colour to.
- Of a reddish brown colour, like that of the pigment.
- In ancient armour, a visor, or projection like the peak of a cap, to which a fixed or movable faceguard was sometimes attached.