Language of a lad brought up outside Rugby (6)
I believe the answer is:
yoruba
'language' is the definition.
(Yoruba is an example)
'a lad brought up outside rugby' is the wordplay.
'lad' becomes 'boy' (I've seen this before**).
'brought up' says the letters should be written in reverse (down clues only).
'outside' means one lot of letters goes inside another.
'rugby' becomes 'ru'.
'a'+'boy'='aboy'
'aboy' reversed gives 'yoba'.
'yoba' going around 'ru' is 'YORUBA'.
'of' is the link.
(Other definitions for yoruba that I've seen before include "West African language" , "Africans" , "W African language" , "A Nigerian language" , "Language of West Africa" .)