Girl who grew up without boyfriend (5)
I believe the answer is:
woman
'girl who grew up' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'without boyfriend' is the wordplay.
'without' becomes 'wo' (abbreviation of 'without', normally with a slash).
'boyfriend' becomes 'man' (I can't justify this - if you can you should give a lot more credence to this answer).
'wo'+'man'='WOMAN'
Can you help me to learn more?
(Other definitions for woman that I've seen before include "See 16" , "Lady" , "person not going on stag-night" , "With 1a [OLD], one's rather timid" , "Mature female" .)