Naval craft digs with a sad guy (11)
I believe the answer is:
minesweeper
'naval craft' is the definition.
'minesweeper' can be an answer for 'craft' (minesweeper is a kind of craft). I am not sure about the 'naval' bit.
'digs with a sad guy' is the wordplay.
'digs' becomes 'mines' (I've seen this in another clue).
'with' says to put letters next to each other.
'a sad guy' becomes 'weeper' (I am not sure about this - if you are sure you should believe this answer much more).
'mines'+'weeper'='MINESWEEPER'
Can you help me to learn more?
(Other definitions for minesweeper that I've seen before include "Naval vessel" , "Warship" , "In the main, clearer" , "PC game" , "One removing bombs" .)