Covering Virginia with sweat, ultimately perverted royal can (8)
I believe the answer is:
lavatory
'can' is the definition.
(synonyms)
'covering virginia with sweat ultimately perverted royal' is the wordplay.
'covering' is an insertion indicator.
'virginia' becomes 'va' (US state abbreviation).
'with' means one lot of letters go next to another.
'ultimately' says to take the final letters.
'perverted' is an anagram indicator.
The last letter of 'sweat' is 't'.
'va'+'t'='vat'
'royal' with letters rearranged gives 'laory'.
'vat' placed within 'laory' is 'LAVATORY'.
(Other definitions for lavatory that I've seen before include "one's flushed" , "Ladies or Gentlemen" , "somewhere to go?" , "Toilet" , "Private chamber" .)