Worn inside the woman's waders (6)
I believe the answer is:
herons
'waders' is the definition.
(heron is a kind of wader)
'worn inside the woman's' is the wordplay.
'worn' becomes 'on'.
'inside' indicates putting letters inside.
'the woman's' becomes 'hers' (pronoun for a woman).
'on' going into 'hers' is 'HERONS'.
(Other definitions for herons that I've seen before include "Wading birds with long legs" , "leggy birds" , "Waders" .)