Raise second quote about hard philosophical investigations (6)
I believe the answer is:
ethics
'philosophical investigations' is the definition.
The answer and definition can be both related to thinking as well as being plural nouns.
Maybe you can see an association between them that I don't see?
'raise second quote about hard' is the wordplay.
'raise' says the letters should be written backwards.
'second' becomes 's' (common abbreviation).
'quote' becomes 'cite' (synonyms).
'about' is an insertion indicator.
'hard' becomes 'h' (abbreviation used in pencil classifications).
's'+'cite'='scite'
'scite' going around 'h' is 'scihte'.
'scihte' reversed gives 'ETHICS'.
Can you help me to learn more?
(Other definitions for ethics that I've seen before include "Code of behaviour" , "Codes of practice for businessmen" , "Some philosophy" , "Code of integrity in business" , "Codes or principles for professional people" .)