Casserole at bistro, ultimately a controversial issue (3,6)

I believe the answer is:

hot potato

'a controversial issue' is the definition.
(I've seen this before)

'casserole at bistro ultimately' is the wordplay.
'casserole' becomes 'hotpot' (I've seen this before).
'ultimately' suggests the final letters.
The final letter of 'bistro' is 'o'.
'hotpot'+'at'+'o'='HOT POTATO'

(Other definitions for hot potato that I've seen before include "Difficult matter" , "Tricky problem" , "controversy" , "Difficult issue" , "Troublesome situation concerning thermal spud" .)

I've seen this clue in The Telegraph.

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