Tyrant puts son in warehouse (6)
I believe the answer is:
despot
'tyrant' is the definition.
(I know that tyrant can be written as despot)
'son in warehouse' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'in' means one lot of letters goes inside another.
'warehouse' becomes 'depot' (I've seen this before).
's' put inside 'depot' is 'DESPOT'.
'puts' is the link.
(Other definitions for despot that I've seen before include "Tyrant, oppressor" , "has first of shocks in store" , "Gaddafi, say" , "nasty ruler?" , "A ruler with unrestricted power" .)