Diesel car Opel recalled to accommodate authorities (7)
I believe the answer is:
oracles
'authorities' is the definition.
(I've seen this before)
'diesel car opel recalled to accommodate' is the wordplay.
'to accommodate' indicates a hidden word (I've seen 'accommodates' mean this).
'recalled' is a reversal indicator (to recall can mean to bring something back).
'selcaro' can be found hidden inside 'diesel car opel'.
'selcaro' back-to-front is 'ORACLES'.
(Other definitions for oracles that I've seen before include "mysterious utterances" , "Prophetic authorities" , "Authoritative sources" , "Wise utterances" , "Authoritative statements" .)