Muffet scarers I'd press into shape (7)

I believe the answer is:

spiders

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

'muffet scarers' is the definition.
I can't tell whether this defines the answer.

'i'd press into shape' is the wordplay.
'i'd press' can be anagrammed to 'SPIDERS'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for spiders that I've seen before include "Insects; rests" , "Arachnids" , "Web weavers" , "Predators on the web" , "14 [BOWIE] 's band from 26 [MARS]" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app