Dub lout misbehaving around factory's entrance suspect (8)
I believe the answer is:
doubtful
'suspect' is the definition.
(I've seen this before)
'dub lout misbehaving around factory's entrance' is the wordplay.
'misbehaving' indicates an anagram.
'around' indicates putting letters inside.
'entrance' indicates taking the first letters.
The first letter of 'factorys' is 'f'.
'dub'+'lout'='dublout'
'dublout' is an anagram of 'doubtul'.
'doubtul' enclosing 'f' is 'DOUBTFUL'.
(Other definitions for doubtful that I've seen before include "Uncertain, suspicious" , "Dubious" , "description of Thomas" , "suspect" , "Open to question, uncertain" .)