New clue, I would say; at the end explain (9)
I believe the answer is:
elucidate
'explain' is the definition.
(I know that elucidate is a type of clarify)
'new clue i would say at the end' is the wordplay.
'new' indicates anagramming the letters.
'would say' becomes 'date' (I am not sure about this - if you are sure you should believe this answer much more).
'at the end' says to put letters next to each other.
'clue' anagrammed gives 'eluc'.
'eluc'+'i'+'date'='ELUCIDATE'
Can you help me to learn more?
(Other definitions for elucidate that I've seen before include "Throw light on a problem, make clear (9)" , "Shed light upon" , "Shed light on, clarify" , "Make clear, explain" , "Make clear and more comprehensible" .)