Old-fashioned youth centre (3)
I believe the answer is:
out
'old-fashioned' is the definition.
(as opposed to 'in')
'youth centre' is the wordplay.
'centre' indicates a hidden word (hidden in the middle of the letters).
'OUT' is hidden in the letters of 'youth'.
(Other definitions for out that I've seen before include "not acceptable" , "Mistaken; unconscious" , "A way to escape" , "Dismissed, in cricket" , "Means of escape" .)