For example, woman will pack extremely ginormous cases (9)
I believe the answer is:
eggshells
'cases' is the definition.
(cases for eggs)
'for example woman will pack extremely ginormous' is the wordplay.
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'woman will' becomes 'she'll' (contraction of 'she will').
'pack' means one lot of letters goes inside another.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'ginormous' with its middle taken out is 'gs'.
'shell' put into 'gs' is 'gshells'.
'eg'+'gshells'='EGGSHELLS'
(Other definitions for eggshells that I've seen before include "Tip-toe gently like walking on ........." , "They're hard to hold yolks" , "Walk delicately as if on these" , "See 1" .)