A little pasta number the Spanish do the wrong way (6)
I believe the answer is:
noodle
'a little pasta' is the definition.
(noodles are a type of pasta)
'number the spanish do the wrong way' is the wordplay.
'number' becomes 'no' (abbreviation).
'the spanish' becomes 'el' ('the' in Spanish).
'the wrong way' is a reversal indicator.
'el'+'do'='eldo'
'eldo' back-to-front is 'odle'.
'no'+'odle'='NOODLE'
(Other definitions for noodle that I've seen before include "Simpleton - strip of pasta" , "strip in the kitchen" , "Simpleton; piece of pasta" , "Dope - put in the soup" , "See silly person" .)