Crossword Genius

Philosophy piece with weak introductory part (8)

Ross

I believe the answer is:

thinking

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'philosophy' is the definition.
(thesaurus)

'piece with weak introductory part' is the wordplay.
'piece' becomes 'king' (king is a kind of piece).
'with' means one lot of letters go next to another.
'weak introductory part' becomes 'thin' (I can't justify this - if you can you should give a lot more credence to this answer).
'king' after 'thin' is 'THINKING'.

Can you help me to learn more?

(Other definitions for thinking that I've seen before include "Cogitating" , "Considering in the mind" , "Rational" , "Pondering" , "Take" .)

I've seen this clue in The Times and The Sunday Times.
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