Failing isn't rare for device with holes (8)
I believe the answer is:
strainer
'device with holes' is the definition.
I can't judge whether this definition defines the answer.
'failing isn't rare' is the wordplay.
'failing' is an anagram indicator (a failed spelling of the word).
'isnt'+'rare'='isntrare'
'isntrare' is an anagram of 'STRAINER'.
'for' is the link.
Can you help me to learn more?
(Other definitions for strainer that I've seen before include "Tea leaf catcher" , "Tea-maker" , "who tries really hard?" , "Tea leaf remover" , "It separates liquids from solids for trainers" .)