Rich German loaf, left out, is pinched (6)
I believe the answer is:
stolen
'is pinched' is the definition.
(I've seen this before)
'rich german loaf left out' is the wordplay.
'rich german loaf' becomes 'stollen' (I've seen this before).
'left' becomes 'l' (common abbreviation).
'out' indicates named letters should be taken away.
'stollen' with 'l' taken away is 'STOLEN'.
(Other definitions for stolen that I've seen before include "Nicked" , "Pinched" , "` `The ... Child' ' (Yeats)" , "Robbed" , "Taken without right" .)