The setter, we hear, is able to outwardly decry something aesthetically pleasing (3,5)
I believe the answer is:
eye candy
'something aesthetically pleasing' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'the setter we hear is able to outwardly decry' is the wordplay.
'the setter' becomes 'I' (the person who set this crossword).
'we hear' shows a homophone (sound like).
'is able to' becomes 'can' (if you can do something you are able to do it).
'outwardly' suggests removing the centre (only the outermost letters are used).
'decry' with its centre taken out is 'dy'.
'i' sounds like 'eye'.
'eye'+'can'+'dy'='EYE CANDY'
Can you help me to learn more?
(Other definitions for eye candy that I've seen before include "pretty images" , "Gorgeous thing" , "Dumb blonde" , "Vacuous Adonis" , "Beautiful people" .)