Islamic prophet left departing sign that man must follow (7)
I believe the answer is:
ibrahim
'islamic prophet' is the definition.
(I've seen this before)
'left departing sign that man must follow' is the wordplay.
'left' shows that the letters should be reversed in order.
'departing sign' becomes 'arbi' (I can't justify this - if you can you should give a lot more credence to this answer).
'that man' becomes 'him' (him refers to a man).
'must follow' means one lot of letters go next to another.
'arbi' in reverse letter order is 'ibra'.
'ibra'+'him'='IBRAHIM'
Can you help me to learn more?
(Other definitions for ibrahim that I've seen before include "Islamic prophet" , "Moslem" .)