Build goes around man-made lake (4)
I believe the answer is:
make
'build' is the definition.
('make' can be a synonym of 'build')
'goes around man-made lake' is the wordplay.
'goes' becomes 'jumps' (jumping is a kind of going).
'around' says to take the centre.
'man-made lake' becomes 'ake' (I can't explain this - if you can you should give a lot more credence to this answer).
The middle of 'jumps' is 'm'.
'm'+'ake'='MAKE'
Can you help me to learn more?
(Other definitions for make that I've seen before include "Create or cause to happen" , "Keep the wolf from the door?" , "Fabricate" , "Hurry up! (slang)" , "Appoint" .)