Girl and boy forming a sort of line (6)
I believe the answer is:
dotted
'line' is the definition.
(thesaurus)
'girl and boy forming a sort' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'ted' and 'ted' is located in the answer.
The remaining letters 'dot' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for dotted that I've seen before include "Covered with spots" , "Sparsely laid out" , "Scattered" , "I may be" , "Sign on this line to authorise" .)