Potential difficulties from Moscow and far north somehow (3,2,5)
I believe the answer is:
can of worms
'potential difficulties' is the definition.
(a can of worms is a difficult issue)
'moscow and far north somehow' is the wordplay.
'and' is a charade indicator (letters next to each other).
'north' becomes 'N' (abbreviation).
'somehow' is an anagram indicator.
'far'+'n'='farn'
'moscow' after 'farn' is 'farnmoscow'.
'farnmoscow' with letters rearranged gives 'CAN OF WORMS'.
'from' is the link.
(Other definitions for can of worms that I've seen before include "Bird's convenience food" , "Potential trouble" , "this may turn out awkward" , "What may prove problematic" , "Something likely to prove awkward" .)