Rather a few, eh? (8)
I believe the answer is:
somewhat
'rather' is the definition.
(I've seen this in another clue)
'a few eh?' is the wordplay.
'a few' becomes 'some' (both can mean a small amount of something).
'eh?' becomes 'what' ('eh' can mean 'pardon' or 'what').
'some'+'what'='SOMEWHAT'
(Other definitions for somewhat that I've seen before include "To a certain degree - a bit" , "To a certain extent" , "To some degree, sort of" , "To a moderate extent" , "To an extent, a little" .)