Tall conifer (7)
(Other definitions for redwood that I've seen before include "Giant North American conifer" , "former Tory minister" , "John -, MP; large tree" , "Conservative MP" , "big in California?" .)
'tall conifer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cedar that I've seen before include "Leaving body" , "Deodar" , "representative of Lebanon?" , "Raced around a mighty tree" , "Great hardwood tree associated with Lebanon" .)