Fletcher's groove (4)
I believe the answer is:
etch
'groove' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
'fletcher's' is the wordplay.
'ETCH' is hidden in amongst the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for etch that I've seen before include "What most engravers presumably find easy to do" , "Imprint vividly" , "Carve (design) on a surface" , "Cut into a block used for printing" , "Design by eating out" .)