Half of Monaco looked loaded (7)
I believe the answer is:
moneyed
'loaded' is the definition.
('moneyed' can be a synonym of 'loaded')
'half of monaco looked' is the wordplay.
'half of' means to take half the letters.
'looked' becomes 'eyed' (eyeing is a kind of looking).
'monaco' with half the letters taken is 'mon'.
'mon'+'eyed'='MONEYED'
(Other definitions for moneyed that I've seen before include "Mo' needy? (Anag)" , "flush" , "Well-to-do" , "Affluent" , "Rich" .)