Pain keeping yours truly in old Scottish county hospital (7)
I believe the answer is:
anguish
'pain' is the definition.
(anguish is pain or suffering)
'yours truly in old scottish county hospital' is the wordplay.
'yours truly' becomes 'I' (the person who set this crossword).
'in' means one lot of letters goes inside another.
'old scottish county' becomes 'angus' (I can't explain this - if you can you should give a lot more credence to this answer).
'hospital' becomes 'H' (abbreviation for hospital on maps).
'i' inserted into 'angus' is 'anguis'.
'anguis'+'h'='ANGUISH'
'keeping' is the link.
Can you help me to learn more?
(Other definitions for anguish that I've seen before include "Agony, distress" , "Severe mental distress" , "Angst" , "Severe pain, may be mental" , "Severe pain, physical or mental" .)