Broadcast nearby, marketing beauty of lake and river (5)
I believe the answer is:
naiad
'river' is the definition.
I know that 'river' relates to this answer. I also know that both the answer and definition are singular nouns
'broadcast nearby marketing beauty of lake and' is the wordplay.
I cannot really see how this works, but
'marketing' could be 'ad' (advertisement is a type of marketing) and 'ad' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
The remaining letters 'ai' 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 naiad that I've seen before include "Greek mythological water nymph" , "River nymph" , "Classic spirit" , "spirit in water" , "Mythological water-nymph" .)