Five to check about the Spanish material (6)
I believe the answer is:
velvet
'material' is the definition.
(velvet is a kind of material)
'five to check about the spanish' is the wordplay.
'five' becomes 'V' (Roman numeral).
'to' is a charade indicator (letters next to each other).
'check' becomes 'vet' (I've seen this before).
'about' means one lot of letters go next to another.
'the spanish' becomes 'el' ('the' in Spanish).
'vet' put after 'el' is 'elvet'.
'v' next to 'elvet' is 'VELVET'.
(Other definitions for velvet that I've seen before include "Fabric with thick soft pile" , "Fabric of silk, cotton or nylon" , "A glove made of this might cover an iron hand" , "Iron fist may be encased in a . . . . . . glove" , "Silky fabric with thick pile" .)