Type of wildebeest seen across Spain (5)
I believe the answer is:
genus
'type' is the definition.
(I've seen this before)
'wildebeest seen across spain' is the wordplay.
'wildebeest' becomes 'gnus' (I've seen this in another clue).
'seen across' means one lot of letters goes inside another.
'spain' becomes 'e' (abbreviation for Espana).
'gnus' enclosing 'e' is 'GENUS'.
'of' is the link.
(Other definitions for genus that I've seen before include "Latin class?" , "Class of animal" , "Taxonomic class between family and species" , "species grouped together" , "Category above species (Biology)" .)