Atmospheric layer the proposer somehow identifies (11)
I believe the answer is:
troposphere
'atmospheric layer' is the definition.
'troposphere' can be an answer for 'layer' (troposphere is a kind of layer). I'm not sure about the 'atmospheric' bit.
'the proposer somehow identifies' is the wordplay.
'the proposer' can be anagrammed to 'TROPOSPHERE'.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for troposphere that I've seen before include "The volume of air closest the earth" , "Region of earth's atmosphere" , "Air at its densest" , "Lowest part of atmosphere" .)