Crossword Genius

Film director's short with Romeo who should know his lines (6)

Ross

I believe the answer is:

angler

I'm a little stuck... Click here to teach me more about this clue!

'film director's short with romeo who should know his' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'lines' is the wordplay.
I cannot really see how this works, but
'lines' could be 'l' (abbreviation as in lines of poetry) and 'l' is present in the answer.
The remaining letters 'anger' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for angler that I've seen before include "One hoping for a catch" , "Fisher with hook and line." , "Hook and line fisherman" , "One proverbially exaggerating" , "A rod and line fisherman" .)

I've seen this clue in The Independent.
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