Trio taken short in country road, finding toilet (7)
I believe the answer is:
latrine
'toilet' is the definition.
(I know that latrine is a type of toilet)
'trio taken short in country road' is the wordplay.
'taken short' means to remove the last letter.
'in' means one lot of letters goes inside another.
'country road' becomes 'lane' (I've seen this in another clue).
'trio' with its last letter removed is 'tri'.
'tri' put within 'lane' is 'LATRINE'.
'finding' acts as a link.
(Other definitions for latrine that I've seen before include "Camp lavatory" , "Where one may go" , "office" , "Primitive toilet" , "Military convenience - reliant (anag)" .)