He takes steps to air his grievance in public (7)
I believe the answer is:
marcher
'steps to air his grievance in public' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot really understand how this works, but
'he' could be 'archer' and 'archer' is present in the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'takes' acts as a link.
Can you help me to learn more?
(Other definitions for marcher that I've seen before include "Frontiersman" , "Travelling demonstrator" , "taking part in demonstration?" , "who may be protesting?" , "Border dweller" .)