Difficulty beginning to trace foreign currency (7)
I believe the answer is:
trouble
'difficulty' is the definition.
(trouble is a kind of difficulty)
'beginning to trace foreign currency' is the wordplay.
'beginning to' indicates taking the first letters.
'foreign currency' becomes 'rouble' (I've seen this in other clues).
The first letter of 'trace' is 't'.
't'+'rouble'='TROUBLE'
(Other definitions for trouble that I've seen before include "Disturb; difficulty" , "Dire straits" , "Misfortune" , "Trial, care, worry" , "Pains" .)