It’s a boring thing (5)
I believe the answer is:
auger
'boring thing' is the definition.
(tool used for boring)
'it's a' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for auger that I've seen before include "Boring-tool" , "something that's boring" , "Boring instrument" , "I bore" , "A tool for boring hole in wood" .)