Hidden within moor, pink plant (5)
I believe the answer is:
orpin
'plant' is the definition.
(orpin is a kind of plant)
'hidden within moor pink' is the wordplay.
'hidden' indicates the answer is hidden within the clue.
'ORPIN' is hidden in the letters of 'within moor pink'.
(Other definitions for orpin that I've seen before include "Stonecrop that's purple" , "Bloomer" , "Purple, broad-leafed stonecrop" , "Plant" , "Variety of stonecrop" .)