Well done everyone,
I am so pleased that I used ISM and not IST because it made it harder.
I have had great fun reading the replies.
ixions clue,including orville and lamb chop was quite brilliant .
Siamcat's was very subtle and clever.
As always, anagrams were found.
But my choice this week is terry (opening=vent+anag) because it made me laugh.
Well done terry,your prize is to come and help me clear all the cow dung from the dairy until it's your turn to write the next word.
Thanks all,keep up the good work,
tonyw