Very unpleasant creature, extremely lazy (7)
I believe the answer is:
beastly
'very unpleasant' is the definition.
(I've seen this before)
'creature extremely lazy' is the wordplay.
'creature' becomes 'beast' ('beast' can be a synonym of 'creature'**).
'extremely' says to hollow out the word (remove centre letters).
'lazy' with its middle removed is 'ly'.
'beast'+'ly'='BEASTLY'
(Other definitions for beastly that I've seen before include "Brutish" , "Bestial" , "Very unpleasant" , "Brutal - foul" , "Horrid" .)