Young flier given new age restriction (6)
I believe the answer is:
eaglet
'young flier' is the definition.
(young eagle)
'given new age restriction' is the wordplay.
'given' is a charade indicator (letters next to each other).
'new' indicates an anagram.
'restriction' becomes 'let' (I've seen this in other clues).
'age' anagrammed gives 'eag'.
'eag' put next to 'let' is 'EAGLET'.
(Other definitions for eaglet that I've seen before include "Bird still in nest" , "Those looking lecherously" , "One hatched in eyrie" , "Raptor chick" , "young flier?" .)