I'm going round the hotel leaving small objects (5)
I believe the answer is:
items
'objects' is the definition.
(I know this)
'i'm going round the hotel leaving small' is the wordplay.
'going round' is an insertion indicator (some letters go around others).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'leaving' indicates named letters should be taken away.
'small' becomes 's' (abbreviation - e.g. clothes size).
'the' with 'h' removed is 'te'.
'im' going around 'te' is 'item'.
'item'+'s'='ITEMS'
(Other definitions for items that I've seen before include "Bits of news" , "Things on a list" , "partners" , "Individual units" , "Separate articles, as on list" .)