Crossword Genius

Growing source of a low noise (4)

Ross

I believe the answer is:

aloe

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

'growing source' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'a low noise' is the wordplay.
'low noise' becomes 'loe' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'loe'='ALOE'

'of' is the link.

Can you help me to learn more?

(Other definitions for aloe that I've seen before include "shrub" , ". . . . vera, soothing plant" , "Plant source of purgative drug" , "Bitter fruit" , "O, ale with bitter plant" .)

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