Cuckoo with crest? They’ll be excited (9)

I believe the answer is:

twitchers

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'they'll be excited' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'cuckoo with crest?' is the wordplay.
'cuckoo' is an anagram indicator (I've seen this in other clues).
'with'+'crest'='withcrest'
'withcrest' is an anagram of 'TWITCHERS'.

Can you help me to learn more?

(Other definitions for twitchers that I've seen before include "unsettled people" , "Naturalists" .)

I've seen this clue in The Guardian.

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