Stretch out his tongue (7)
I believe the answer is:
spanish
'tongue' is the definition.
(Spanish is an example)
'stretch out his' is the wordplay.
'stretch' becomes 'span' (I've seen this before).
'out' is an anagram indicator.
'his' is an anagram of 'ish'.
'span'+'ish'='SPANISH'
(Other definitions for spanish that I've seen before include "From Valencia or Malaga?" , "Institution set up in 1478 by King Ferdinand and Queen Isabella to safeguard Catholic orthodoxy" , "Don Quixote's tongue" , "Language of Madrid" , "Foreign language" .)