Stop working on indicator board perhaps (6)
I believe the answer is:
resign
'stop' is the definition.
(thesaurus)
'working on indicator board perhaps' is the wordplay.
I cannot really understand how this works, but
'on' could be 're' (regarding) and 're' is located in the answer.
'indicator' could be 'sign' (I've seen this before) and 'sign' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for resign that I've seen before include "Give up one's job" , "Stand down" , "advice for the incompetent?" , "Abdicate" , "Give up one's post" .)