Turner in chopper crossing lake (4)
I believe the answer is:
axle
'turner' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'chopper crossing lake' is the wordplay.
'chopper' becomes 'axe' (something which chops).
'crossing' is an insertion indicator.
'lake' becomes 'L' (geographical abbreviation).
'axe' enclosing 'l' is 'AXLE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for axle that I've seen before include "Wheel pivot" , "Rod of wheelbase" , "Shaft with wheels attached" , "Mandrel" , "Wheel support" .)