Angels somehow spare that man (8)
I believe the answer is:
seraphim
'angels' is the definition.
(I've seen this before)
'somehow spare that man' is the wordplay.
'somehow' indicates anagramming the letters.
'that man' becomes 'him' (I've seen this before**).
'spare' anagrammed gives 'serap'.
'serap'+'him'='SERAPHIM'
(Other definitions for seraphim that I've seen before include "High-ranking angels" , "High spirits" , "Highest order of angels" , "Angelic beings" , "Angelic types" .)