Some overseas lines (5)
I believe the answer is:
verse
'lines' is the definition.
(I've seen this before)
'some overseas' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'VERSE' can be found hidden inside 'overseas'.
(Other definitions for verse that I've seen before include "Literature in metrical form" , "literary offering" , "few lines of writing?" , "Piece of poetry" , "Poems" .)