A fish's egg found in the protective wear (8)
I believe the answer is:
leggings
'a fish's egg found in the protective wear' is the definition.
I can't tell whether this defines the answer.
'a fish's egg found in' is the wordplay.
'a fish' becomes 'lings' (ling is a type of fish).
'found in' indicates putting letters inside.
'lings' enclosing 'egg' is 'LEGGINGS'.
Can you help me to learn more?
(Other definitions for leggings that I've seen before include "Close-fitting trousers" , "Garments for lower limbs" , "Ski-pants without stirrups" .)