Hired thug ran away from the capital of Myanmar (4)
I believe the answer is:
goon
'hired thug' is the definition.
(I've seen this before)
'ran away from the capital of myanmar' is the wordplay.
'ran away' becomes 'ran' ('run' can be a synonym of 'run away').
'from' suggests deleting specific letters.
'the capital of myanmar' becomes 'rangoon' (I've seen this before).
'rangoon' with 'ran' removed is 'GOON'.
(Other definitions for goon that I've seen before include "Stupid person" , "He's very stupid" , "Silly person - bully (US)" , "Sellers for example" , "someone rather stupid" .)