Dig entertaining love film -- it's lyrical (6)
I believe the answer is:
poetry
'dig' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'entertaining love film it's lyrical' is the wordplay.
'entertaining' is an insertion indicator.
'love' becomes 'o' (love means zero in tennis).
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'it's lyrical' becomes 'pry' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'et'='oet'
'oet' placed within 'pry' is 'POETRY'.
Can you help me to learn more?
(Other definitions for poetry that I've seen before include "'Best words in best order' (Coleridge)" , "Sonnets, limericks etc" , "Verse" , "Literary art" , "Literary genre" .)