Some calling out in a strange language (5)
I believe the answer is:
lingo
'a strange language' is the definition.
(I've seen this before)
'some calling out in' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'LINGO' can be found hidden inside 'calling out in'.
(Other definitions for lingo that I've seen before include "Jargon, foreign language (informal)" , "Language (informally)" , "Johnny Foreigner speaks one" , "Language, colloquially speaking." , "Patois" .)