Mash somehow gets stuck in opera singer's tongue (8)
I believe the answer is:
kashmiri
'tongue' is the definition.
(Kashmiri is an example)
'mash somehow gets stuck in opera singer's' is the wordplay.
'somehow' is an anagram indicator.
'gets stuck in' indicates putting letters inside.
'opera singer' becomes 'kiri' (I've seen this before).
'mash' is an anagram of 'ashm'.
'ashm' put into 'kiri' is 'KASHMIRI'.
(Other definitions for kashmiri that I've seen before include "person in divided state" , "Native of India/Pakistan border region" , "Asian region" , "language" , "One from subcontinent" .)