Crossword Genius

Small parasite sits on small bark of deciduous plants (10)

Ross

I believe the answer is:

stickweeds

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

'small' is the definition.
I know nothing about this answer so I can't judge whether this works.

'parasite sits on small bark of deciduous plants' is the wordplay.
I cannot quite understand how this works, but
'parasite' could be 'tick' (I've seen this before) and 'tick' is present in the answer.
'plants' could be 'weeds' (weed is a kind of plant) and 'weeds' is found in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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