That's OK, oddly as work (4)
I believe the answer is:
task
'work' is the definition.
(task is a kind of work)
'that's ok oddly' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'thats'+'ok'='thatsok'
The alternating letters of 'thatsok' are 'TASK'.
'as' is the link.
(Other definitions for task that I've seen before include "Assignment" , "Job, undertaking" , "commission" , "Arduous bit of work" , "Burden with work" .)