Sailor transporting Saint Nicholas to Russia? (4)
I believe the answer is:
'nicholas to russia?' is the definition.
(Tsar Nicholas of Russia)
'sailor transporting saint' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'transporting' means one lot of letters goes inside another.
'saint' becomes 's'.
'tar' placed around 's' is 'TSAR'.
(Other definitions for tsar that I've seen before include "Despot" , "Ruler finally executed" , "Russian monarch" , "Powerful man" , "Russian leader" .)