Distress and gravity remarkably rife (5)
I believe the answer is:
grief
'distress' is the definition.
(I've seen this before)
'gravity remarkably rife' is the wordplay.
'gravity' becomes 'g'.
'remarkably' is an anagram indicator (I've seen this in other clues).
'rife' is an anagram of 'rief'.
'g'+'rief'='GRIEF'
'and' is the link.
(Other definitions for grief that I've seen before include "Distress" , "Deep sadness" , "Suffering" , "trouble" , "Great sorrow at someone's death" .)