Possible Clues:

• Country that celebrates the new year ('Choul Chnam Thmey') in April
• Eccentric graduate taking in cricket match in unlikely place?
• About to get help, old boy and old lady going over country
• Turns up, support starts with old boy's mother from college in Asia
• State spies holding a Frenchman bringing up date of birth
• State agents must arrest a married bloke
• American guy employed by agency in country out east
• A married chap in CIA country
• You'll find this in 21 across for instance and in Asia
• Neighbor of Thailand