Stand where wet weather catches half of them (6)
I believe the answer is:
remain
'stand' is the definition.
(I know that stand is a more specific form of the action remain)
'wet weather catches half of them' is the wordplay.
'wet weather' becomes 'rain' (rain is wet weather).
'catches' is an insertion indicator.
'half of' indicates taking half.
'them' with half the letters taken is 'em'.
'rain' enclosing 'em' is 'REMAIN'.
'where' is the link.
(Other definitions for remain that I've seen before include "Survive" , "Continue in position" , "Stay, don't go" , "Don't leave (the EU?)" , "Stay (in a place)" .)