One about to spill, clumsily, something in the cupboard (8)

I believe the answer is:

allspice

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'something in the cupboard' is the definition.
I can't tell whether this defines the answer.

'one about to spill clumsily' is the wordplay.
'one about' is an insertion indicator.
'to' becomes 'ace' (I am not sure about this - if you are sure you should believe this answer much more).
'clumsily' indicates anagramming the letters.
'spill' is an anagram of 'llspi'.
'ace' enclosing 'llspi' is 'ALLSPICE'.

Can you help me to learn more?

(Other definitions for allspice that I've seen before include "fragrant plant" , "Aromatic West Indian tree" , "Pimento or Jamaica pepper" , "Pill case (anag.)" , "Dried aromatic fruit from the West Indies" .)

I've seen this clue in the Evening Standard.

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