Runs onto a jetty producing sword (6)
I believe the answer is:
rapier
'sword' is the definition.
(rapier is a kind of sword)
'runs onto a jetty' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'onto' says to put letters next to each other.
'jetty' becomes 'pier' (I've seen this before).
'r'+'a'+'pier'='RAPIER'
'producing' acts as a link.
(Other definitions for rapier that I've seen before include "Straight sword with narrow blade" , "Straight narrow sword with two edges" , "Thin sharp sword" , "Thrusting weapon" , "fencing equipment" .)