Units in temple belt round it perhaps (5)
I believe the answer is:
waist
'belt round it perhaps' is the definition.
I can't judge whether this defines the answer.
'units in temple' is the wordplay.
'units' becomes 'is' ('I' can be a synonym of 'unit').
'in' indicates putting letters inside.
'temple' becomes 'wat' (type of Asian temple eg Angkor Wat).
'is' placed into 'wat' is 'WAIST'.
Can you help me to learn more?
(Other definitions for waist that I've seen before include "Middle part of the body" , "Narrow part of body" , "Between ribs and hips" , "part of frame" , "Midriff" .)