Trout's tail in batter that's needed in kitchen (3-6)

I believe the answer is:

tin-opener

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'that's needed in kitchen' is the definition.
(utensil used in a kitchen)

'trout's tail in batter' is the wordplay.
'tail' indicates one should take the final letters.
'batter' becomes 'opener' (I can't explain this - if you can you should believe this answer much more).
The last letter of 'trout' is 't'.
't'+'in'+'opener'='TIN-OPENER'

Can you help me to learn more?

(Other definitions for tin-opener that I've seen before include "Kitchen tool" , "Kitchen utensil" .)

I've seen this clue in The Times.

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