Guide leewards, oddly? (4)
I believe the answer is:
lead
'guide' is the definition.
(lead can mean to usher or guide)
'leewards oddly?' is the wordplay.
'oddly?' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'leewards' are 'LEAD'.
(Other definitions for lead that I've seen before include "Chief part, element" , "Guide the heavy metal" , "Metal; show the way" , "Guide; metallic element" , "Advantage" .)