Dutch boats crossing line gives great pleasure (8)
I believe the answer is:
delights
'gives great pleasure' is the definition.
I can't tell whether this defines the answer.
'dutch boats crossing line' is the wordplay.
'dutch boats' becomes 'dights' (I can't justify this - if you can you should believe this answer much more).
'crossing' means one lot of letters goes inside another (to cross can mean to go over or around).
'line' becomes 'el' (el is a kind of line).
'dights' enclosing 'el' is 'DELIGHTS'.
Can you help me to learn more?
(Other definitions for delights that I've seen before include "Transports" , "Slighted by pleasures" , "Pleasures; pleases" .)