Muldoon or Meehan, for instance, will write opening, reflective pieces (4)
I believe the answer is:
poet
'muldoon or meehan for instance' is the definition.
I can't judge whether this defines the answer.
'write opening reflective pieces' is the wordplay.
'pieces' says the answer is hidden in the clue (I've seen 'piece' mean this).
'reflective' says the letters should be written in reverse.
'teop' is hidden in the letters of 'write opening'.
'teop' reversed gives 'POET'.
'will' is the link.
Can you help me to learn more?
(Other definitions for poet that I've seen before include "Burns was one" , "'Paul Muldoon or Paula Meehan, say (4)'" , "author" , "Bridges possibly" , "Rhymer" .)