Climber wants a spike returned (5)
I believe the answer is:
liana
'climber' is the definition.
(thesaurus)
'a spike returned' is the wordplay.
'spike' becomes 'nail' (I've seen this before).
'returned' is a reversal indicator.
'a'+'nail'='anail'
'anail' written backwards gives 'LIANA'.
'wants' is the link.
(Other definitions for liana that I've seen before include "Woody climbing tropical plant -- a nail (anag)" , "Woody forest climber" , "Jungle climber" , "Jungle creeper" , "Woody climbing (usually tropical) plant" .)