Nothing disturbed bees like being overweight (5)
I believe the answer is:
obese
'being overweight' is the definition.
(thesaurus)
'nothing disturbed bees' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'disturbed' indicates anagramming the letters.
'bees' is an anagram of 'bese'.
'o'+'bese'='OBESE'
'like' acts as a link.
(Other definitions for obese that I've seen before include "Extremely portly" , "Too chubby" , "Carrying far too much weight" , "indecently large)" , "Pathologically fat" .)