Crossword Genius

Keeps going like a parasite (5,2)

Ross

I believe the answer is:

hangs on

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

'keeps' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

'going like a parasite' is the wordplay.
I cannot really see how this works, but
'going' could be 'on' (both can mean functioning or activated) and 'on' is found within the answer.
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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