Some safety pin gets lost in office work (6)
I believe the answer is:
typing
'office work' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'some safety pin gets lost' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TYPING' is hidden within 'safety pin gets lost'.
'in' is the link.
Can you help me to learn more?
(Other definitions for typing that I've seen before include "Using one form of keyboard" , "Keyboarding" .)