Central shipyard allows owner to build tower (5)
I believe the answer is:
pylon
'tower' is the definition.
(tower-like structure carrying electrical cables)
'central shipyard allows owner' is the wordplay.
'central' means to look at the middle letters.
'allows owner' becomes 'lon' (I can't explain this - if you can you should believe this answer much more).
The centre of 'shipyard' is 'py'.
'py'+'lon'='PYLON'
'to build' is the link.
Can you help me to learn more?
(Other definitions for pylon that I've seen before include "Power cable supporter" , "Structure supporting power cables" , "current supporter" , "Power cable support" , "Cable-holding frame" .)