Unruly behaviour in delicatessen I'd worried over (9)
I believe the answer is:
rowdiness
'unruly behaviour' is the definition.
(I've seen this before)
'in delicatessen i'd worried over' is the wordplay.
'in' says the answer is hidden in the clue.
'over' shows that the letters should be reversed in order.
'ssenidwor' can be found hidden inside 'delicatessen id worried'.
'ssenidwor' reversed gives 'ROWDINESS'.
(Other definitions for rowdiness that I've seen before include "noisy behaviour" , "Noise, disorder" , "Disorderly behaviour" , "Wordiness leading to boisterous behaviour" , "Unruly behaviour" .)