It's on hand in the sewing room (7)
I believe the answer is:
thimble
'sewing room' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'it's on hand in the' is the wordplay.
I cannot quite understand how this works, but
'hand' could be 'l' (abbreviation for left, as in the left-hand side) and 'l' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for thimble that I've seen before include "Protection from a needle" , "sewer cover?" , "Digital protection" , "Finger protection when sewing" , "one player conceals in game" .)