Some inch along in saintly glow (4)
I believe the answer is:
halo
'saintly glow' is the definition.
(I've seen this in another clue)
'some inch along in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'HALO' is hidden in the letters of 'inch along in'.
(Other definitions for halo that I've seen before include "Circle of light round the sun or moon" , "Corona" , "Saintly ring" , "Angel's head-light" , "Sign of holiness" .)