Blunt heads of overseas bank taking on employment (6)
I believe the answer is:
obtuse
'blunt' is the definition.
(I've seen this in another clue)
'heads of overseas bank taking on employment' is the wordplay.
'heads of' suggests taking the first letters.
'on' is a charade indicator (letters next to each other).
'employment' becomes 'use' (how something is used).
The first letters of 'overseas bank taking' is 'obt'.
'obt'+'use'='OBTUSE'
(Other definitions for obtuse that I've seen before include "Annoyingly insensitive" , "To be thus blunt" , "Can't quite see the angle" , "(Of angle) between 90° and 180° - dull" , "Slow of understanding" .)