Moving picture of a little puppy’s tail (5)
I believe the answer is:
weepy
'puppy's tail' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'moving picture of a little' is the wordplay.
I cannot quite understand how this works, but
'little' could be 'wee' ('wee' can be similar in meaning to 'little') and 'wee' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for weepy that I've seen before include "Tearful; sad film" , "Sobbing" , "Lachrymose" , "sentimental" , "Sad movie (colloq.)" .)