Traveller from Venice has bow in hair — old look (5,4)
I believe the answer is:
marco polo
'traveller from venice' is the definition.
(I know this)
'bow in hair old look' is the wordplay.
'bow' becomes 'arc' (both can mean a curve).
'in' means one lot of letters goes inside another.
'hair' becomes 'mop' (mop can mean a mass of hair).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'look' becomes 'lo' (archaic exclamation meaning 'look!').
'arc' put into 'mop' is 'marcop'.
'marcop'+'o'+'lo'='MARCO POLO'
'has' is the link.
(Other definitions for marco polo that I've seen before include "Adventurous traveller" , "13th-century Venetian traveller" , "Great Venetian explorer of China and Asia in 14th century" , "Merchant of Venice" , "Historic trader" .)