Inexperienced (5)
'inexperienced' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for green that I've seen before include "Politician; fresh" , "Eco-friendly" , "Gullible" , "Unripe; environmentalist" , "Ecologically beneficial" .)
'inexperienced' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for naive that I've seen before include "Callow" , "Simple in style or behaviour" , "Lack of experience, innocent" , "Too simple and trusting" , "Too credulous or trusting" .)
'inexperienced' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for callow that I've seen before include "Immature and inexperienced, as youth often is" , "Young and inexperienced" , "Jejune" , "Green" , "23 [BRIGHTONIAN] actor" .)