Swatch of satin initially rather bulky (6)
I believe the answer is:
sample
'swatch' is the definition.
(thesaurus)
'satin initially rather bulky' is the wordplay.
I cannot quite understand how this works, but
'bulky' could be 'ample' (I've seen this before) and 'ample' is located in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for sample that I've seen before include "Take" , "A specimen of maples" , "Small part representing the whole" , "Taste(r)" , "Test the specimen" .)