Felt anti an all-night sitting? (6)

I believe the answer is:

probed

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'felt' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for probed that I've seen before include "Did research" , "Questioned or examined thoroughly and closely" , "Examined, dug into" , "Investigating closely" , "Investigated closely as dentist does a tooth" .)

I've seen this clue in the Evening Standard.

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