Complications no good in stories (7)
I believe the answer is:
tangles
'complications' is the definition.
('tangle' can be a synonym of 'complication')
'no good in stories' is the wordplay.
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'in' is an insertion indicator.
'stories' becomes 'tales' ('tale' can be a synonym of 'story'**).
'n'+'g'='ng'
'ng' inserted within 'tales' is 'TANGLES'.
(Other definitions for tangles that I've seen before include "Knots" , "Sent gal (anag.)" .)