Tyrant finally dies in warehouse (6)
I believe the answer is:
despot
'tyrant' is the definition.
(synonyms)
'finally dies in warehouse' is the wordplay.
'finally' suggests the final letters.
'in' is an insertion indicator.
'warehouse' becomes 'depot' (I've seen this in another clue).
The last letter of 'dies' is 's'.
's' placed into 'depot' is 'DESPOT'.
(Other definitions for despot that I've seen before include "Louis XVI was one" , "Possibly 4 [CZAR]" , "Tyranical dictator" , "Tyrannical dictator" , "Autocrat" .)