'Out!' Eric is exposing body parts (5)
I believe the answer is:
uteri
'body parts' is the definition.
(uterus is a kind of body part)
'out eric is exposing' is the wordplay.
'is exposing' indicates a hidden word (I've seen 'exposes' mean this).
'UTERI' can be found hidden inside 'out eric'.
(Other definitions for uteri that I've seen before include "Organs reproducing" , "organs, in hospital patients" , "several organs" , "Wombs" , "Developing places" .)