Country invested in trouble so thoroughly! (7)

I believe the answer is:

lesotho

'country' is the definition.
(I know that Lesotho is a African country)

'invested in trouble so thoroughly' is the wordplay.
'invested in' indicates the answer is hidden within the clue.
'LESOTHO' is hidden within 'trouble so thoroughly'.

(Other definitions for lesotho that I've seen before include "African country, formerly Basutoland" , "Independent kingdom, an enclave of South Africa" , "Kingdom within South Africa" , "South African kingdom" , "African territory" .)

I've seen this clue in The Telegraph.

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