Loose, small garments (6)
I believe the answer is:
slacks
'garments' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how one could define the other.
'loose small' is the wordplay.
'loose' becomes 'slack' (synonyms).
'small' becomes 's' (abbreviation - e.g. clothes size).
'slack'+'s'='SLACKS'
Can you help me to learn more?
(Other definitions for slacks that I've seen before include "Loose casual trousers" , "Works lazily; trousers" , "casual attire" , "Avoids work - trousers" , "Pants for casual wear" .)