Cryptic clue about providing radical Morning Star (7)
I believe the answer is:
Here is my best explanation:
'morning star' is the definition.
'cryptic clue about providing radical' is the subsidiary indication.
'cryptic' indicates an anagram (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'providing' becomes 'if' (I've seen this in other clues).
'radical' becomes 'r' (chemistry abbreviation).
'clue' is an anagram of 'luce'.
'luce' going around 'if' is 'lucife'.
(Other definitions for lucifer that I've seen before include "Devil - match!", "Satan, the Dark Angel", "Match - Satan", "Evil spirit", "from the abyss?", "once a match for > Dickens", "Star", "the adversary", "Beelzebub, Old Nick" and "Light".)