A cat can do it in many ways (3)
I believe the answer is:
mew
'a cat can do' is the definition.
I can't judge whether this defines the answer.
'it in many ways' is the wordplay.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'in' means one lot of letters goes inside another.
'many ways' becomes 'mw' (this might be a standard abbreviation which I don't know about).
'e' inserted within 'mw' is 'MEW'.
Can you help me to learn more?
(Other definitions for mew that I've seen before include "Seagull" , "Make sound like cat, or a gull" , "Miaow" , "Sound made by a cat" , "Feline sound" .)