Darling second little piece of neckwear (7)
I believe the answer is:
sweetie
'darling' is the definition.
(I've seen this in another clue)
'second little piece of neckwear' is the wordplay.
'second' becomes 's' (common abbreviation).
'little' becomes 'wee' (similar in meaning).
'piece of neckwear' becomes 'tie' (I've seen this in another clue).
's'+'wee'+'tie'='SWEETIE'
(Other definitions for sweetie that I've seen before include "honey" , "Darling" , "Maybe boyfriend" , "Term of endearment" , "Barley sugar, for example" .)