Feelings silly person is hiding in one unpublished work (11)

I believe the answer is:

impressions

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'feelings' is the definition.
(I know this)

'silly person is hiding in one unpublished work' is the wordplay.
'silly' indicates an anagram.
'hiding in' is an insertion indicator.
'one unpublished work' becomes 'ims' (I can't explain this - if you can you should give a lot more credence to this answer).
'person'+'is'='personis'
'personis' with letters rearranged gives 'pression'.
'pression' going into 'ims' is 'IMPRESSIONS'.

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(Other definitions for impressions that I've seen before include "Popular books may go through several of these" , "Impersonations" , "opinions" .)

I've seen this clue in The Guardian.

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