Traveller to drive back, lukewarm about PO (5,4)
I believe the answer is:
marco polo
'traveller' is the definition.
(13th-century explorer)
'drive back lukewarm about po' is the wordplay.
'drive' becomes 'ram' (RAM drive on a computer).
'back' shows that the letters should be reversed in order.
'lukewarm' becomes 'colo' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'ram' back-to-front is 'mar'.
'colo' going around 'po' is 'copolo'.
'mar'+'copolo'='MARCO POLO'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for marco polo that I've seen before include "Old travelling salesman" , "traveller in East" , "Merchant of Venice" , "Venetian adventurer" , "Venetian travel writer, who may (or may not) have served Kublai Khan, d. 1324" .)