Raisin drops a Muslim ruler (6)
I believe the answer is:
sultan
'ruler' is the definition.
(I know that Sultan is a type of ruler)
'raisin drops a muslim' is the wordplay.
'raisin' becomes 'sultana' (sultana is a kind of raisin).
'drops' suggests deleting specific letters.
'a' becomes 'an'.
'muslim' becomes 'n' (I am not sure about this - if you are sure you should believe this answer much more).
'sultana' with 'an' taken out is 'sulta'.
'sulta'+'n'='SULTAN'
Can you help me to learn more?
(Other definitions for sultan that I've seen before include "Ottoman sovereign" , "one ruling the roost?" , "Sovereign of a Muslim state" , "Ruler of Brunei" , "Turkish ruler" .)