About to return currency commission (6)
I believe the answer is:
errand
'commission' is the definition.
(I've seen this before)
'about to return currency' is the wordplay.
'about' becomes 're' (regarding).
'to return' shows that the letters should be reversed in order.
'currency' becomes 'rand' (I've seen this before).
're' in reverse letter order is 'er'.
'er'+'rand'='ERRAND'
(Other definitions for errand that I've seen before include "Native of a former German kingdom" , "Mission (usually run!)" , "Task, message" , "Short mission -- ran red (anag)" , "Short journey to carry message for Renard" .)