Stones county administrations that limit mobile program (9)
I believe the answer is:
sapphires
'stones' is the definition.
(I know this)
'county administrations that limit mobile program' is the wordplay.
I cannot really see how this works, but
'program' could be 'app' (type of computer program) and 'app' is found within the answer.
'county' could be 'shire' (term for a county, eg Hampshire, Warwickshire etc) and 'shire' is present in the remaining letters.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sapphires that I've seen before include "precious stones" , "Blue gems" .)