Crossword Genius

Philosophy failing to sum up Henry VIII latterly? (8)

Ross

I believe the answer is:

thinking

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

'philosophy' is the definition.
(thesaurus)

'failing to sum up henry viii latterly?' is the wordplay.
I cannot really understand how this works, but
'henry' could be 'king' (Henry VIII etc) and 'king' is found within the answer.
The remaining letters 'thin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for thinking that I've seen before include "rationale" , "consideration" , "Take" , "Pondering" , "Thought" .)

I've seen this clue in The Times.
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