Crossword Genius

The decimated part (5)

Ross

I believe the answer is:

tenth

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'part' is the definition.
(I've seen this before)

'the decimated' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'decimated' becomes 'enth' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'enth'='TENTH'

Can you help me to learn more?

(Other definitions for tenth that I've seen before include "0.1" , "Fraction in tithe" , "Decimal part?" , "after nine" , "(Decimal?) fraction" .)

I've seen this clue in the Evening Standard.
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