Okay...... so if we take the letters after the last letters in
JIMBO17A* One of the bullies in "The Simpsons", ___ Jones
[-----] and
MENS23A* Part of a department store for those looking for "masculine" clothing
[----] , and the letters before the last letters in
KEBS50A* Abbr. for the Bureau of Standards of Kenya
[----] and
JLO59A* "Out of Sight" star, familiarly
[---] and we get P,U,R,L but... that can't be it.....