Remove boat parked on stretch of land (8)
I believe the answer is:
subtract
'remove' is the definition.
(I've seen this before)
'boat parked on stretch of land' is the wordplay.
I cannot quite understand how this works, but
'boat' could be 'sub' (submarine) and 'sub' is located in the answer.
'stretch' could be 'tract' (a tract is a stretch of land) and 'tract' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for subtract that I've seen before include "Take an amount away" , "dock" , "Remove" , "Deduct" , "Take one quantity away from another" .)