Lying for the country has caught ambassador finally (9)
I believe the answer is:
prostrate
'lying' is the definition.
(thesaurus)
'for the country has caught ambassador finally' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'the country' becomes 'state' ('state' can be a synonym of 'country'**).
'has caught' means one lot of letters goes inside another.
'finally' says to take the final letters.
The last letter of 'ambassador' is 'r'.
'state' enclosing 'r' is 'strate'.
'pro'+'strate'='PROSTRATE'
(Other definitions for prostrate that I've seen before include "Lying face downwards" , "Face to the ground" , "Prone" , "no longer able to stand" , "Lying stretched out" .)