Ground elder's back - what, more soil improver? (9)
I believe the answer is:
earthworm
'soil improver?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'ground elder's back what more' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'back' says to take the final letters (the letter at the back).
The last letter of 'elder' is 'r'.
'r'+'what'+'more'='rwhatmore'
'rwhatmore' anagrammed gives 'EARTHWORM'.
Can you help me to learn more?
(Other definitions for earthworm that I've seen before include "One burrows" , "Soil dweller" , "What mole eats" , "Soil-dwelling invertebrate" , "Creepy-crawly" .)