Sorry to lug ferret around (9)
I believe the answer is:
regretful
'sorry' is the definition.
(I know that sorry can be written as regretful)
'lug ferret around' is the wordplay.
'around' is an anagram indicator.
'lug'+'ferret'='lugferret'
'lugferret' is an anagram of 'REGRETFUL'.
'to' acts as a link.
(Other definitions for regretful that I've seen before include "penitent" , "Sorry, rueful" , "Feeling guilt over something" , "Miss Otis was" , "but not Ms Piaf" .)