Immature, inexperienced (6)

I believe the answer is:

callow

I believe this is a double definition.

'immature' is the first definition.
(similar in meaning)

'inexperienced' is the second definition.
(synonyms)

(Other definitions for callow that I've seen before include "23 [BRIGHTONIAN] actor" , "Immature and inexperienced, like youth" , "Inexperienced or innocent" , "Immature and inexperienced, as youth often is" , "Young and inexperienced" .)

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

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