Mexican lake-dweller too lax to swim on lake (7)

I believe the answer is:

axolotl

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'mexican lake-dweller' is the definition.
I can't judge whether this defines the answer.

'too lax to swim on lake' is the wordplay.
'to swim' indicates an anagram.
'on' means one lot of letters goes inside another (as in clothing 'on' a person).
'lake' becomes 'L' (geographical abbreviation).
'too'+'lax'='toolax'
'toolax' with letters rearranged gives 'axootl'.
'axootl' placed around 'l' is 'AXOLOTL'.

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(Other definitions for axolotl that I've seen before include "Mexican native" , "Aquatic salamander of N America" , "Central American salamander - lax tool (anag)" , "Mexican salamander - allot ox (anag)" , "Type of salamander" .)

I've seen this clue in The Independent.

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