Growing source of a low noise (4)
I believe the answer is:
aloe
'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" .)