Left one carpet free (8)
I believe the answer is:
liberate
'free' is the definition.
(I know that free can be written as liberate)
'left one carpet' is the wordplay.
'left' becomes 'l' (common abbreviation).
'one' becomes 'i' (Roman numeral).
'carpet' becomes 'berate' (I've seen this before).
'l'+'i'+'berate'='LIBERATE'
(Other definitions for liberate that I've seen before include "Set free, emancipate" , "Make free" , "Set free, release from slavery" , "Set free, rescue from bondage" , "let go" .)