Section of memoir I briefly make fun of (3)
I believe the answer is:
rib
'make fun of' is the definition.
(synonyms)
'section of memoir i briefly' is the wordplay.
'section of' indicates a hidden word.
'RIB' can be found hidden inside 'memoir i briefly'.
(Other definitions for rib that I've seen before include "Bone; supporting member" , "Eve was known as Adam's ..." , "joke" , "Vein structure in a leaf" , "structural member" .)