Herald left, getting wind up (7)
I believe the answer is:
portend
'herald' is the definition.
(I've seen this before)
'left getting wind up' is the wordplay.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'getting' says to put letters next to each other.
'wind up' becomes 'end' (I've seen this in another clue).
'port'+'end'='PORTEND'
(Other definitions for portend that I've seen before include "forecast" , "Betoken; presage" , "Omen" , "Presage, bode" , "Give warning" .)