E.g. corner of hardened pastry case as discarded (3,5)
I believe the answer is:
set piece
'e g corner' is the definition.
I can't judge whether this definition defines the answer.
'hardened pastry case as discarded' is the wordplay.
'hardened' becomes 'set' (synonyms).
'pastry' becomes 'pie' (pie is a kind of pastry).
'discarded' indicates named letters should be taken away.
'case' with 'as' taken out is 'ce'.
'set'+'pie'+'ce'='SET-PIECE'
'of' is the link.
Can you help me to learn more?
(Other definitions for set piece that I've seen before include "Formal arrangement based on steep ice" , "Carefully structured and practised speech - see pi, etc (anag)" , "Formal or elaborate arrangement as in art" , "oft-rehearsed play" , "Something arranged for maximum effect" .)