Foreign character comic's irony is totally out of bounds (7)
I believe the answer is:
omicron
'foreign character' is the definition.
(Greek letter)
'of bounds' is the wordplay.
'of' becomes 'o''.
'bounds' becomes 'micron' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'micron'='OMICRON'
'comic's irony is totally out' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for omicron that I've seen before include "character from Athens" , "Foreign letter -- I'm no roc (anag)" , "letter from 13 [HELLENE]" , "Greek short 'o'" , "Moronic (anag) - Greek letter" .)