Upset about party’s position that’s sometimes silly? (3-3)
I believe the answer is:
mid-off
'position that's sometimes silly?' is the definition.
I can't judge whether this defines the answer.
'upset about party's' is the wordplay.
'upset' becomes 'miff' (I've seen this in another clue).
'about' indicates putting letters inside.
'party' becomes 'do' (do can informally mean a party).
'miff' enclosing 'do' is 'MID-OFF'.
Can you help me to learn more?
(Other definitions for mid-off that I've seen before include "Position in the field" , "Someone in field" , "Cricket fielding position" .)