In hearing, one safely securing capital (6)
I believe the answer is:
ankara
'capital' is the definition.
(capital of Turkey)
'in hearing one safely' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is present in the answer.
The remaining letters 'kara' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'securing' acts as a link.
Can you help me to learn more?
(Other definitions for ankara that I've seen before include "Capital established by Ataturk" , "Turkish city" , "European capital" , "Turkish capital" , "Capital of Turkey" .)