Shown in many as 'a landlocked country of old' (9)
I believe the answer is:
nyasaland
'country of old' is the definition.
'nyasaland' can be an answer for 'country' (Nyasaland is an example). I'm not sure about the 'of old' bit.
'shown in many as a landlocked' is the wordplay.
'shown in' indicates the answer is hidden within the clue.
'NYASALAND' is hidden in the letters of 'many as a landlocked'.
Can you help me to learn more?
(Other definitions for nyasaland that I've seen before include "old African country" , "Malawi, formerly" , "Former colony" , "Pre-1964 Malawi" .)