As Im working out targets (4)
I believe the answer is:
aims
'targets' is the definition.
('aim' can be a synonym of 'target')
'as im working out' is the wordplay.
'working out' indicates an anagram (an anagram must be worked out from the letters).
'as'+'im'='asim'
'asim' with letters rearranged gives 'AIMS'.
(Other definitions for aims that I've seen before include "Sets sight on target" , "Objectives, purposes" , "objects" , "Sets sight on, having ambitions" , "Trains - intentions" .)