A welder moved downwind (7)
I believe the answer is:
leeward
'downwind' is the definition.
(similar in meaning)
'a welder moved' is the wordplay.
'moved' is an anagram indicator.
'a'+'welder'='awelder'
'awelder' anagrammed gives 'LEEWARD'.
(Other definitions for leeward that I've seen before include "Quarter towards which the wind blows" , "away from the weather" , "Heading for shelter" , "side of sailors" , "place out of the wind" .)