Suffering Scotsman eats one hot (7)
I believe the answer is:
anguish
'suffering' is the definition.
(I know that anguish is a type of suffering)
'scotsman eats one hot' is the wordplay.
'scotsman' becomes 'angus' (I've seen this before).
'eats' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'hot' becomes 'h' (abbreviation eg on taps).
'angus' placed around 'i' is 'anguis'.
'anguis'+'h'='ANGUISH'
(Other definitions for anguish that I've seen before include "Heartache, great distress" , "Severe pain, physical or mental" , "Severe mental distress" , "Great suffering" , "extreme pain" .)