Legs up, darling, just a little (7)
I believe the answer is:
snippet
'a little' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'legs up darling' is the wordplay.
'legs' becomes 'pins' (pin is a kind of leg).
'up' is a reversal indicator (in down clue: letters go upwards).
'darling' becomes 'pet' (both are terms of endearment).
'pins' back-to-front is 'snip'.
'snip'+'pet'='SNIPPET'
'just' is the link.
Can you help me to learn more?
(Other definitions for snippet that I've seen before include "piece from the paper" , "Bit (of info?)" , "Brief extract" , "A cutting" , "Newspaper extract" .)