"Untouchable" Eliot (4)
I believe the answer is:
ness
'untouchable eliot' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ness that I've seen before include "Scottish Loch with legendary monster" , "Where you're reputed to see monster" , "Scottish Lough of monster myth" , "something added for quality" , "Eliot -, led effort against Al Capone; Scots loch" .)