Crossword Genius

What aging philosopher did, possibly, showing no consideration? (11)

Ross

I believe the answer is:

thoughtless

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

'consideration?' is the definition.
(I have seen 'Lacking consideration ' mean 'thoughtless' so perhaps 'consideration' could also mean 'thoughtless')

'what aging philosopher did possibly showing no' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'ought' (I've seen this in another clue) and 'ought' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for thoughtless that I've seen before include "Showing little consideration for others" , "Insensitive" , "Inconsiderate - reckless" , "Lacking consideration" , "Uncaring" .)

I've seen this clue in The Times.
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