Inexperienced and going to pieces in an emergency (5)
I believe the answer is:
green
'inexperienced' is the definition.
(similar in meaning)
'and going to pieces in an emergency' is the wordplay.
'and' becomes 'n' (common abbreviation for 'and').
'going to' is a charade indicator (letters next to each other).
'pieces in an emergency' becomes 'gree' (I am not sure about this - if you are sure you should believe this answer much more).
'n' after 'gree' is 'GREEN'.
Can you help me to learn more?
(Other definitions for green that I've seen before include "Area around a golf hole" , "The colour of immaturity" , "conservationist" , "political activist" , "Unripe; envious" .)