Act badly and demand lewd attention (7)
I believe the answer is:
catcall
'lewd attention' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'act badly and demand' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'and' is a charade indicator (letters next to each other).
'demand' becomes 'call' (call is a kind of demand).
'act' is an anagram of 'cat'.
'cat'+'call'='CATCALL'
Can you help me to learn more?
(Other definitions for catcall that I've seen before include "Barracking" , "Audibly disapprove" , "Feline whistle of disapproval" , "Mocking shout or whistle" , "Derisive cry" .)