One of many concealed in wall at home? (4)
I believe the answer is:
lath
'one of many concealed' is the definition.
I can't tell whether this definition defines the answer.
'in wall at home?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LATH' can be found hidden inside 'wall at home'.
(Other definitions for lath that I've seen before include "Thin strip of wood used in plastering" , "Narrow strip of wood used as backing for plasterwork" , "Strip of wood, backing for plaster say" , "Plaster-supporting wood strip" , "A thin strip of wood as for making furniture" .)