In extremity, editor might be touched (8)
I believe the answer is:
fingered
'touched' is the definition.
(fingering is a kind of touching)
'in extremity editor might be' is the wordplay.
'in' indicates putting letters inside.
'extremity' becomes 'fin' (fin is a kind of extremity).
'editor' becomes 'ed' (abbreviation).
'might be' becomes 'ger' (I can't explain this - if you can you should believe this answer much more).
'fin'+'ed'='fined'
'fined' going around 'ger' is 'FINGERED'.
Can you help me to learn more?
(Other definitions for fingered that I've seen before include "Identified as guilty" , "with digital equipment" , "Did some shopping" .)