Surfer uses this gear seen in waves, worn by companion (6,6)
I believe the answer is:
search engine
'surfer uses' is the definition.
I know nothing about this answer so I can't judge whether this works.
'gear seen in waves worn by companion' is the wordplay.
'waves' indicates anagramming the letters.
'worn by' means one lot of letters goes inside another (outside letters are worn by those on the inside).
'companion' becomes 'ch' (Companion of Honour).
'gear'+'seen'+'in'='gearseenin'
'gearseenin' is an anagram of 'searengine'.
'searengine' placed around 'ch' is 'SEARCH ENGINE'.
'this' is the link.
Can you help me to learn more?
(Other definitions for search engine that I've seen before include "Online helper" , "internet facility" , "Program for locating information" , "Yahoo or Google. for example" .)