Rule lifted by king in March (4)
I believe the answer is:
walk
'march' is the definition.
(I know that march is a kind of the walk)
'rule lifted by king' is the wordplay.
'rule' becomes 'law' (law is a kind of rule).
'lifted' shows that the letters should be reversed in order (going up in down clue).
'by' is a charade indicator (letters next to each other).
'king' becomes 'K' (chess abbreviation).
'law' written backwards gives 'wal'.
'wal'+'k'='WALK'
'in' is the link.
(Other definitions for walk that I've seen before include "Travel on foot" , "Stroll" , "Proceed on foot" , "Perambulate" , "Be a pedestrian" .)