Trimmed around edge (3)
I believe the answer is:
rim
'edge' is the definition.
(rim is a kind of edge)
'trimmed around' is the wordplay.
'around' indicates a hidden word.
'RIM' is hidden in the letters of 'trimmed'.
(Other definitions for rim that I've seen before include "Edge, border" , "Upper or outer edge" , "Edge - lip" , "Top edge" , "Brim, edge" .)