Inexperienced and unimportant? Okay (5,5)
I believe the answer is:
green light
'okay' is the definition.
(thesaurus)
'inexperienced and unimportant?' is the wordplay.
'inexperienced' becomes 'green' (similar in meaning).
'and' says to put letters next to each other.
'unimportant?' becomes 'light' (I've seen this before).
'green'+'light'='GREEN LIGHT'
(Other definitions for green light that I've seen before include "Signal for go" , "something to go on" , "Signal of consent" , "Seal of approval" , "Signal to proceed" .)