Managed to be overwhelmed by frets about relocation (8)
I believe the answer is:
transfer
'relocation' is the definition.
'managed to be overwhelmed by frets about' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'to be overwhelmed by' means one lot of letters goes inside another (I've seen this in other clues).
'about' indicates anagramming the letters.
'frets' is an anagram of 'tsfer'.
'ran' inserted inside 'tsfer' is 'TRANSFER'.
(Other definitions for transfer that I've seen before include "Move to another side or team" , "player's move" , "Move (something) across" , "a side to side movement in soccer, perhaps" , "handover" .)