Loves an anagram to decipher (5)
I believe the answer is:
solve
'to decipher' is the definition.
(I've seen this in another clue)
'loves an anagram' is the wordplay.
'an anagram' indicates an anagram.
'loves' is an anagram of 'SOLVE'.
(Other definitions for solve that I've seen before include "Unscramble" , "Work out (a clue)" , "Find an answer to (a problem)" , "Decipher" , "Find the key - work out" .)