Mythical bird caught in low country (7)
I believe the answer is:
morocco
'country' is the definition.
(I know that Morocco is an country)
'mythical bird caught in low' is the wordplay.
'mythical bird' becomes 'roc' (mythical giant bird).
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'low' becomes 'moo' (both can mean to make the noise of a cow).
'roc'+'c'='rocc'
'rocc' placed inside 'moo' is 'MOROCCO'.
(Other definitions for morocco that I've seen before include "state of Africa" , "Casablanca's country" , "in which literature may be bound to sell" , "Soft leather used for in book binding" , "Arab state" .)