Boy secures lines on trees for film industry (9)
I believe the answer is:
bollywood
'film industry' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'boy secures lines on trees' is the wordplay.
'secures' indicates putting letters inside.
'lines' becomes 'll' (an abbreviation for line written twice).
'on' is a charade indicator (letters next to each other).
'trees' becomes 'wood'.
'boy' placed around 'll' is 'bolly'.
'bolly'+'wood'='BOLLYWOOD'
'for' is the link.
Can you help me to learn more?
(Other definitions for bollywood that I've seen before include "In foreign films" , "Indian film industry" .)