A pouch, small with long tail at one end (6)
I believe the answer is:
sachet
'a pouch' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'small with long tail at one end' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'with long tail' becomes 'ache' (I can't explain this - if you can you should believe this answer much more).
'one end' indicates one should take the final letters.
The last letter of 'at' is 't'.
's'+'ache'+'t'='SACHET'
Can you help me to learn more?
(Other definitions for sachet that I've seen before include "Package" , "'Small soft bag, for perfumed powder say (6)'" , "Small sealed envelope" , "Chaste as a sealed plastic bag" , "Small bag - chaste (anag)" .)