Material one wanker sent without packaging (7)
I believe the answer is:
nankeen
'material' is the definition.
(nankeen is a kind of material)
'one wanker sent without packaging' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nankeen that I've seen before include "Chinese cotton cloth" , "trouser material" , "Yellowish stuff" , "Buff-coloured cotton cloth" , "Buff colour(ed cloth)" .)