Embarrassed setter intends to apologise initially to guy (3,2,4)

I believe the answer is:
ill at ease
'embarrassed setter' is the definition.
'ill at ease' can be an answer for 'embarrassed' (I've seen this before). I'm unsure of the 'setter' bit.
'intends to apologise initially to guy' is the wordplay.
'intends' becomes 'ill' (I can't justify this - if you can you should believe this answer much more).
'to' is a charade indicator (letters next to each other).
'initially' suggests taking the first letters.
'to guy' becomes 'tease' (guy can mean to tease or make fun of).
The initial letter of 'apologise' is 'a'.
'ill'+'a'+'tease'='ILL-AT-EASE'
Can you help me to learn more?
(Other definitions for ill at ease that I've seen before include "Nervous, uncomfortable" , "Unable to relax" , "Unsettled, anxious" , "appear uncomfortable" , "Unsure and constrained in manner" .)
