Spike with a broken point (5)
I believe the answer is:
piton
'spike' is the definition.
(piton is a kind of spike)
'a broken point' is the wordplay.
'a broken' indicates anagramming the letters.
'point' anagrammed gives 'PITON'.
'with' acts as a link.
(Other definitions for piton that I've seen before include "Climber's spike" , "Peg driven into rock as climbing support" , "Spike to support a climber" , "Peg used in mountaineering" , "climber needs this" .)