Am rather large; it’s said you initially outgrew us; that’s cryptic (9)

I believe the answer is:

ambiguous

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'that's cryptic' is the definition.
(I've seen this before)

'am rather large it's said you initially outgrew us' is the wordplay.
'rather large' becomes 'big' (synonyms. I am not sure about the 'rather' bit.).
'it's said' indicates a 'sounds like' (homophone) clue.
'initially' suggests taking the first letters.
The first letter of 'outgrew' is 'o'.
'you' is a homophone of 'u'.
'am'+'big'+'u'+'o'+'us'='AMBIGUOUS'

Can you help me to learn more?

(Other definitions for ambiguous that I've seen before include "Murky" , "cryptic" , "not clear" , "Unclear one way or the other" , "Having more than one possible meaning" .)

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

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