Angular figure in dapper Homburg (5)
I believe the answer is:
rhomb
'angular figure' is the definition.
'in dapper homburg' is the wordplay.
'in' says the answer is hidden in the clue.
'RHOMB' is hidden within 'dapper homburg'.
(Other definitions for rhomb that I've seen before include "Crystal with six faces having parallel edges" , "Diamond shape" , "Lozenge" , "Figure on plane" , "Quadrilateral with four equal sides" .)