Star reading different script, ultimately (3,5)
I believe the answer is:
red giant
'star' is the definition.
(I've seen this before)
'reading different script ultimately' is the wordplay.
'different' indicates an anagram.
'ultimately' suggests the final letters.
The final letter of 'script' is 't'.
'reading' is an anagram of 'redgian'.
'redgian'+'t'='RED GIANT'
(Other definitions for red giant that I've seen before include "Large star nearing the end of its life" , "Type of star" , "Megastar" , "Huge Communist" , "Cool, immense star of high luminosity" .)