What might be left, say, in frilly surroundings (6)
I believe the answer is:
legacy
'what might be left' is the definition.
(a legacy is left in a will)
'say in frilly surroundings' is the wordplay.
'say' becomes 'eg'.
'in frilly' becomes 'lacy' (I can't justify this - if you can you should believe this answer much more).
'surroundings' means one lot of letters goes inside another.
'eg' inserted into 'lacy' is 'LEGACY'.
Can you help me to learn more?
(Other definitions for legacy that I've seen before include "Hand-me-down" , "Something handed down" , "One inherited" , "Post-death gift" , "Inheritance" .)