Wholly absorbed senders go crazy (9)

I believe the answer is:

engrossed

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'wholly absorbed' is the definition.
'engrossed' can be an answer for 'absorbed' (synonyms). I am not sure about the 'wholly' bit.

'senders go crazy' is the wordplay.
'crazy' indicates an anagram.
'senders'+'go'='sendersgo'
'sendersgo' anagrammed gives 'ENGROSSED'.

Can you help me to learn more?

(Other definitions for engrossed that I've seen before include "Totally absorbed" , "occupied" , "Wrapt, immersed" , "Gripped" , "Consumed" .)

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