Tags on software without a purpose (7)

I believe the answer is:

appends

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'tags on' is the definition.
('append' can be a synonym of 'tag on')

'software without a purpose' is the wordplay.
'software' becomes 'app' (software application).
'without a purpose' becomes 'ends' (I can't explain this - if you can you should give a lot more credence to this answer).
'app'+'ends'='APPENDS'

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(Other definitions for appends that I've seen before include "Attaches to the end of" , "Hangs on" , "Adds on to the end" .)

I've seen this clue in The Daily Express.

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