Back from Chernobyl in the morning, criminal's glowing (7)
I believe the answer is:
lambent
'glowing' is the definition.
(synonyms)
'back from chernobyl in the morning criminal's' is the wordplay.
'back from' suggests the final letters (the letter at the back of the word).
'in the morning' becomes 'am' (short for ante meridiem - before noon).
'criminal' becomes 'bent' (bent can mean corrupt or criminal).
The last letter of 'chernobyl' is 'l'.
'l'+'am'+'bent'='LAMBENT'
(Other definitions for lambent that I've seen before include "Republic of Ireland" , "Softly bright or radiant; flickering" , "inflamed?" , "Of flame or light, playing about a surface" , "Flickering like malt, Ben" .)