Personification of sun initially shining over Llandudno (3)
I believe the answer is:
sol
'personification of sun' is the definition.
(Roman sun god)
'initially shining over llandudno' is the wordplay.
'initially' says to take the initial letters.
The initial letters of 'shining over llandudno' is 'SOL'.
(Other definitions for sol that I've seen before include "A Latin sun" , "nearby star" , "Spanish and poetic sun" , "Note, old french coin" , "Roman counterpart of Helios" .)