Bike part from Benin? True, surprisingly (5,4)
I believe the answer is:
inner tube
'bike part' is the definition.
(part of a bicycle)
'benin? true surprisingly' is the wordplay.
'surprisingly' indicates an anagram (a surprising ordering of the letters).
'benin'+'true'='benintrue'
'benintrue' anagrammed gives 'INNER TUBE'.
'from' acts as a link.
(Other definitions for inner tube that I've seen before include "Tyre filler" , "One used to inflation going by bicycle" , "What cyclist pumps up" , "inflatable ring" , "rubber ring" .)