Soft sheen is in it to thrill us tremendously (6)
I believe the answer is:
lustre
'soft sheen' is the definition.
'lustre' can be an answer for 'sheen' (synonyms). I am not sure about the 'soft' bit.
'in it to thrill us tremendously' is the wordplay.
'LUSTRE' is hidden in amongst the letters.
However, I'm unsure how the hidden word is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for lustre that I've seen before include "Radiance; reflective surface" , "number of years" , "Rustle with shine on surface" , "Brightness from reflected light" , "Glory; soft glow" .)