Strimmed around edge (3)
I believe the answer is:
rim
'edge' is the definition.
(rim is a kind of edge)
'strimmed around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'RIM' is hidden within 'strimmed'.
(Other definitions for rim that I've seen before include "Brim, edge" , "An edge, canyon or cup" , "Edge, border" , "Edge or margin" , "'Brim, lip (3)'" .)