Tom may take a walk (3)

I believe the answer is:

cat

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'tom' is the definition.
(a tom is a male cat)

'may take a walk' is the wordplay.
'may' becomes 'can' (synonyms).
'take' is a deletion indicator.
'a' becomes 'an'.
'walk' becomes 'at' (I can't explain this - if you can you should believe this answer much more).
'can' with 'an' taken out is 'c'.
'c'+'at'='CAT'

Can you help me to learn more?

(Other definitions for cat that I've seen before include "Pussy" , "Grimalkin" , "See 23" , "Feline mammel" , "Carnivore; whip" .)

I've seen this clue in the Evening Standard.

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