Attaches blame for sending back vegetable (7)
I believe the answer is:
parsnip
'vegetable' is the definition.
(parsnip is a type of vegetable)
'attaches blame for sending back' is the wordplay.
'attaches' becomes 'pins' (pinning is a kind of attaching).
'blame for' becomes 'rap' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sending back' is a reversal indicator.
'pins'+'rap'='pinsrap'
'pinsrap' in reverse letter order is 'PARSNIP'.
Can you help me to learn more?
(Other definitions for parsnip that I've seen before include "A white root vegetable" , "Yellow root vegetable" , "Pips ran oddly through the vegetable" , "Spar pin (anag) - vegetable" , "food" .)