Language with some vowel shortage (5)
I believe the answer is:
welsh
'language' is the definition.
(Welsh is an example)
'with some vowel shortage' is the wordplay.
'with' indicates a hidden word.
'WELSH' can be found hidden inside 'some vowel shortage'.
(Other definitions for welsh that I've seen before include "From a western part of Britain" , "Leave without paying" , "Coming from Swansea?" , "Cymric" , "and 14 Down: Melted cheese on toast" .)