I had left eastern loch, showing laziness (8)
I believe the answer is:
idleness
'laziness' is the definition.
(I know that idleness is a type of laziness)
'i had left eastern loch' is the wordplay.
'i had' becomes 'i'd' (I'd).
'left' becomes 'l' (common abbreviation).
'eastern' becomes 'e'.
'loch' becomes 'ness' (Loch Ness in Scotland).
'id'+'l'+'e'+'ness'='IDLENESS'
'showing' acts as a link.
(Other definitions for idleness that I've seen before include "Lazy quality" , "State of inactivity" , "Sloth - there may be love in it" , "Having a loaf" , "Reluctance to work" .)