Bars intrude into ship (6)
I believe the answer is:
spokes
'bars' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?
'intrude into ship' is the wordplay.
'intrude' becomes 'poke' (I can't explain this - if you can you should give a lot more credence to this answer).
'into' indicates putting letters inside.
'ship' becomes 'ss'.
'poke' placed inside 'ss' is 'SPOKES'.
Can you help me to learn more?
(Other definitions for spokes that I've seen before include "Radials of a wheel" , "Parts of a wheel" , "Radial supports on a wheel" , "Bicycle wheel struts" .)