Count on this as Cuba disintegrates (6)

I believe the answer is:

abacus

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'count on this' is the definition.
The definition suggests a singular noun which matches the answer.

'as cuba disintegrates' is the wordplay.
'disintegrates' indicates an anagram (I've seen 'disintegrated' mean this).
'as'+'cuba'='ascuba'
'ascuba' with letters rearranged gives 'ABACUS'.

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(Other definitions for abacus that I've seen before include "Old counting-frame" , "not something we now count on" , "summer once?" , "calculator needed" , "Counting device" .)

I've seen this clue in The Sun.

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