Crew's handrail fixed for famous participant of voyage (7,6)
I believe the answer is:
charles darwin
'famous participant of voyage' is the definition.
'crew's handrail fixed' is the wordplay.
'fixed' is an anagram indicator.
'crews'+'handrail'='crewshandrail'
'crewshandrail' is an anagram of 'CHARLES DARWIN'.
'for' is the link.
(Other definitions for charles darwin that I've seen before include "Naturalist on HMS Beagle" , "Great Victorian" , "Author of The Descent of Man" .)