Determine as indication... (6)
I believe the answer is:
assign
'determine' is the definition.
(I know that assign is a more specific form of the action choose)
'as indication' is the wordplay.
'indication' becomes 'sign' (I've seen this in another clue).
'as'+'sign'='ASSIGN'
(Other definitions for assign that I've seen before include "award" , "Transfer property" , "Give responsibility to" , "Transfer or appoint to" , "Allocate (duties to someone)" .)