Dead time after month full of enjoyment (7)
I believe the answer is:
defunct
'dead' is the definition.
('defunct' can be similar in meaning to 'dead')
'time after month full of enjoyment' is the wordplay.
'time' becomes 't'.
'after' means one lot of letters go next to another.
'month' becomes 'dec' (Dec is an example**).
'full of' means one lot of letters goes inside another.
'enjoyment' becomes 'fun' (I've seen this before).
'dec' going around 'fun' is 'defunc'.
't' after 'defunc' is 'DEFUNCT'.
(Other definitions for defunct that I've seen before include "Dead, no longer existing" , "No longer living or in force" , "No longer in use" , "Extinct" , "Inoperative" .)