Brown one among pureed peas (5)
I believe the answer is:
sepia
'brown' is the definition.
(I know that sepia is a type of brown)
'one among pureed peas' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
an anagram of 'peas' is 'sepa' which is within the left over letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sepia that I've seen before include "source of ink" , "tone of pictures?" , "Colourant" , "Old drawing" , "cuttle" .)