Girl and boy forming a sort of line (6)
I believe the answer is:
Here is my best explanation:
'line' is the definition.
'girl and boy forming a sort' is the wordplay.
I cannot quite see 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?