Cryptic clue about providing radical Morning Star (7)
I believe the answer is:
lucifer
'morning star' is the definition.
(thesaurus)
'cryptic clue about providing radical' is the wordplay.
'cryptic' is an anagram indicator (I've seen this in other clues).
'about' is an insertion indicator.
'providing' becomes 'if' (I've seen this in other clues).
'radical' becomes 'r' (chemistry abbreviation).
'clue' anagrammed gives 'luce'.
'luce' enclosing 'if' is 'lucife'.
'lucife'+'r'='LUCIFER'
(Other definitions for lucifer that I've seen before include "Satan, the Dark Angel" , "Beelzebub, Old Nick" , "from the abyss?" , "Devilish sort of match" , "once a match for > Dickens" .)