Include subscription amount on end of invoice (7)

I believe the answer is:

subsume

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'include' is the definition.
(subsuming is a kind of including)

'subscription amount on end of invoice' is the wordplay.
'subscription' becomes 'subs'.
'amount on' becomes 'um' (I am not sure about this - if you are sure you should believe this answer much more).
'end of' says to take the final letters.
The final letter of 'invoice' is 'e'.
'subs'+'um'+'e'='SUBSUME'

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(Other definitions for subsume that I've seen before include "Absorb into something else" , "Include, absorb" , "Incorporate" .)

I've seen this clue in The Times.

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