Drove one crazy, being sloppy (11)
I believe the answer is:
sentimental
'sloppy' is the definition.
(thesaurus)
'drove one crazy' is the wordplay.
'drove' becomes 'sent' (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'crazy' becomes 'mental' (I've seen this before).
'sent'+'i'+'mental'='SENTIMENTAL'
'being' is the link.
(Other definitions for sentimental that I've seen before include "Soft-hearted; romantic" , "Feeling much" , "Expressing tender emotions" , "Evoking tender emotions" , "With tender, nostalgic or sad feelings" .)