Crossword Genius

Just the creature to wallop its victim? (7)

Ross

I believe the answer is:

lamprey

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

'victim?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'just the creature to wallop its' is the wordplay.
I cannot really understand how this works, but
'creature' could be 'prey' (prey is a kind of animal) and 'prey' is present in the answer.
'wallop' could be 'lam' (I've seen this in another clue) and 'lam' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for lamprey that I've seen before include "Eel-like animal" , "Freshwater eel-like fish" , "sucker for stones" , "Eel-like creature - play REM (anag)" , "Eel-like vertebrate with a sucker mouth and horny teeth" .)

I've seen this clue in the Evening Standard.
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