Daughter caught in rain storm is a low point (5)
I believe the answer is:
nadir
'low point' is the definition.
(I've seen this before)
'daughter caught in rain storm' is the wordplay.
'daughter' becomes 'd'.
'caught in' indicates putting letters inside.
'storm' indicates anagramming the letters.
'rain' is an anagram of 'nair'.
'd' put inside 'nair' is 'NADIR'.
'is a' acts as a link.
(Other definitions for nadir that I've seen before include "Low-water mark" , "Low spot" , "businessman formerly escaping justice" , "Drain to lowest level" , "Dinar (anag.)" .)