Cut back parts of brooches (4)
I believe the answer is:
pins
'parts of brooches' is the definition.
'pins' can be an answer for 'brooches' (I've seen this in another clue). I am not sure about the 'parts of' bit.
'cut back' is the wordplay.
'cut' becomes 'snip' (snipping is a kind of cutting).
'back' says the letters should be written backwards.
'snip' reversed gives 'PINS'.
Can you help me to learn more?
(Other definitions for pins that I've seen before include "Stocking fillers" , "security codes" , "With needles, they create a tingling sensation" , "Wire fasteners" .)