Vapour traps made holes in overshoes (8)
I believe the answer is:
galoshes
'overshoes' is the definition.
(galosh is a kind of overshoe)
'vapour traps made holes' is the wordplay.
'vapour' becomes 'gas' (I've seen this before).
'traps' means one lot of letters goes inside another.
'made' indicates an anagram.
'holes' with letters rearranged gives 'loshe'.
'gas' going around 'loshe' is 'GALOSHES'.
'in' is the link.
(Other definitions for galoshes that I've seen before include "Waterproof overshoes" , "Overshoes usually made of rubber" , "footwear" , "Go hassle to get overshoes" .)