Lavished love on a girl and a boy (5)
I believe the answer is:
doted
'lavished love' is the definition.
(I've seen this in another clue)
'girl and a boy' is the wordplay.
'girl' becomes 'dot' ().
'and' is a charade indicator (letters next to each other).
'a boy' becomes 'ed' (short for Edward).
'dot'+'ed'='DOTED'
'on a' acts as a link.
(Other definitions for doted that I've seen before include "Was weakly affectionate" , "Lavished affection" , "- Upon means was foolishly fond of (someone)" , "was foolish" , "Was excessively fond" .)