Insubstantial brownies? First piece dispatched (4-5)
I believe the answer is:
airy-fairy
'piece dispatched' is the definition.
I can't judge whether this defines the answer.
'insubstantial brownies?' is the wordplay.
'insubstantial' becomes 'airy' (similar in meaning).
'brownies?' becomes 'fairy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'airy'+'fairy'='AIRY-FAIRY'
'first' is the link.
Can you help me to learn more?
(Other definitions for airy-fairy that I've seen before include "Fanciful or impractical for breezy elf" , "Lightweight" , "Fanciful and impractical like breezy sprite" , "Fanciful, not based on reality" , "Unrealistic - fanciful" .)