Repeat letters from writer at ease (7)
I believe the answer is:
iterate
'repeat' is the definition.
(I know that repeat can be written as iterate)
'letters from writer at ease' is the wordplay.
'letters from' says the answer is hidden in the clue (a selection of letters from the clue).
'ITERATE' is hidden in the letters of 'writer at ease'.
(Other definitions for iterate that I've seen before include "State repeatedly, say again" , "Utter or perform repeatedly" , "Recapitulate" , "Repeat, state again" , "Say again, repeat" .)