Shrek and Fiona (5)
I believe the answer is:
ogres
'shrek and fiona' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ogres that I've seen before include "Giant types" , "Awful brutes" , "huge figures" , "She-giant of fairy tale" , "Monsters can be goers" .)