Indicates the safety pin's not fastened (6,3)
I believe the answer is:
points out
'indicates' is the definition.
('point out' can be a synonym of 'indicate')
'the safety pin's not fastened' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'pin's' could be 'pins' and 'pins' is found in the leftover letters.
The remaining letters 'out' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for points out that I've seen before include "Draws attention to" , "mistakes in the score" , "Indicates" .)