Daggers concealed in robe lining (5)
I believe the answer is:
obeli
'daggers' is the definition.
(I've seen this before)
'concealed in robe lining' is the wordplay.
'concealed in' indicates a hidden word.
'OBELI' is hidden within 'robe lining'.
(Other definitions for obeli that I've seen before include "They refer to bottom" , "signs of doubt" , "Dagger-shaped signs" , "signs of suspect text" , "Printer's daggers" .)