Crossword Genius

We in Delhi get American garden matter (5)

Ross

I believe the answer is:

humus

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

'matter' is the definition.
(humus is a kind of matter)

'we in delhi get american garden' is the wordplay.
I cannot really understand how this works, but
'we' could be 'us' and 'us' is present in the answer.
The remaining letters 'hum' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for humus that I've seen before include "decomposing organic matter" , "Rich organic material from dead leaves, plants etc" , "Organic stuff" , "Organic material in topsoil" , "Organic component of soil" .)

I've seen this clue in The Hindu.
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