Turf hunk out of Britain with tendency for trouble (4,3)
I believe the answer is:
sods law
'tendency for trouble' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'turf hunk out of britain' is the wordplay.
'turf' becomes 'sod' (synonyms).
'hunk' becomes 'slab' (I've seen this in another clue).
'out' means to remove the last letter.
'of britain' becomes 'w' (I can't explain this - if you can you should give a lot more credence to this answer).
'slab' with its final letter taken away is 'sla'.
'sod'+'sla'+'w'='SODS-LAW'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for sods law that I've seen before include "Rule that if anything can go wrong it will" , "That which suggests that, if something can go wrong, it will!" , "Expect the worst!" , "Pessimistic theory" , "This is bound to happen" .)