An outpouring enshrining one’s suffering (7)
I believe the answer is:
anguish
'suffering' is the definition.
(I know that anguish is a type of suffering)
'an outpouring enshrining one's' is the wordplay.
'outpouring' becomes 'gush'.
'enshrining' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'gush' placed around 'i' is 'guish'.
'an'+'guish'='ANGUISH'
(Other definitions for anguish that I've seen before include "Extreme torment" , "Severe pain, may be mental" , "Agony, distress" , "Extreme mental distress" , "extreme pain" .)