Scotsman broken by onset of injury and hard suffering (7)
I believe the answer is:
anguish
'suffering' is the definition.
(I know that anguish is a type of suffering)
'scotsman broken by onset of injury and hard' is the wordplay.
'scotsman' becomes 'angus' (I've seen this before).
'broken by' indicates putting letters inside (inserted letters break into the word).
'onset of' suggests taking the first letters.
'and' says to put letters next to each other.
'hard' becomes 'h' (abbreviation used in pencil classifications).
The first letter of 'injury' is 'i'.
'angus' going around 'i' is 'anguis'.
'anguis'+'h'='ANGUISH'
(Other definitions for anguish that I've seen before include "Mental torment" , "Angst" , "Severe mental distress" , "extreme pain" , "Grief" .)