Crossword Genius

She watches birds and shudders (8)

Ross

I believe the answer is:

twitcher

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

'watches birds and shudders' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'she' is the wordplay.
I cannot really see how this works, but
'she' could be 'cher' and 'cher' is found within the answer.
The remaining letters 'twit' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for twitcher that I've seen before include "Bird-watcher (colloq)" , "Rare bird spotter" , "Measure; creep" , "One not still" , "Nervous person" .)

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