Crossword Genius

Earthly enrichment a chap can possibly rue? (6)

Ross

I believe the answer is:

manure

I'm a little stuck... Click here to teach me more about this clue!

'earthly enrichment' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'a chap can possibly rue?' is the wordplay.
'a chap can' becomes 'man' (I can't justify this - if you can you should believe this answer much more).
'possibly' indicates an anagram.
'rue' anagrammed gives 'ure'.
'man'+'ure'='MANURE'

Can you help me to learn more?

(Other definitions for manure that I've seen before include "Organic fertiliser" , "Animal excreta as fertiliser" , "should promote growth" , "Animal excreta used to fertilise land" , "Crap" .)

I've seen this clue in the Evening Standard.
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