Is it like a trout swimming around Beach Head? (6)

I believe the answer is:

turbot

I'm a little stuck... Click here to teach me more about this clue!

'is it' is the definition.
I can't judge whether this definition defines the answer.

'trout swimming around beach head?' is the wordplay.
'swimming' is an anagram indicator (letters swim around into a new order).
'around' is an insertion indicator.
'head?' suggests taking the first letters (I've seen 'head' mean this).
The first letter of 'beach' is 'b'.
'trout' anagrammed gives 'turot'.
'turot' enclosing 'b' is 'TURBOT'.

'like a' is the link.

Can you help me to learn more?

(Other definitions for turbot that I've seen before include "Flatfish - trout B (anag)" , "[SOMETHING FISHY]" , "Swimmer" , "Species of flatfish" , "Expensive flatfish" .)

I've seen this clue in the Evening Standard.

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